Weatherby Mark V Serial Number

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The Finest Bolt Actions Ever Produced

The 9-lug Mark V is a heavy action, basically designed for Weatherby magnum cartridges. Weatherby subsequently addressed this by the introduction of a considerably lighter 6-lug (two rows of three) action for standard calibers. Weatherby's Mark V is probably the best of the modern, push feed bolt actions. Japanese Weatherby I just received a Weatherby Mark V Deluxe in 300 Magnum made in Japan from the estate of my boss who passed away last month. The serial number is H123XXX. From the test target included with the rifle it was made in April of 1979 and test fired on April 16, 1979.

By Chuck Hawks

Every so often I make reference to a bolt action in either favorable or unfavorable terms, as applied to big game hunting. (I'm talking about the actual action here, not the complete rifle.) My comments are based on the fundamental design of the action, its quality and the basic features that it incorporates. Big game hunting is different from varmint hunting, bench rest shooting, target shooting or sniping and requires different features from an action.

This article features the best bolt actions with which I am familiar, actions I would suggest using as the basis for a custom built hunting rifle. Some of these are used in modern rifles that you can purchase at your local gun shop and others are long out of production and are available only in used rifles. What they have in common is exceptional suitability for use in a big game hunting rifle.

Here are some of the features that are desirable in a top quality bolt action (beyond the most obvious such as suitable quality steel and correct manufacturing and assembly) in no particular order:

• One piece steel bolt for strength and durability.
• Front locking lugs to minimize cartridge case stretch.
• Cocks on opening the bolt to take advantage of the superior leverage.
• One piece firing pin (striker) for strength and positive ignition.
• Recoil lug integral with (machined as part of) the receiver.
• Routes hot powder gasses away from the shooter's face in the event of a blown case.
• User adjustable trigger.
• One piece bottom iron for strength and rigidity.
• Hinged magazine floorplate.
• Generous loading/ejection port that facilitates loading cartridges from the top.
• Short bolt rotation (60-degrees or less) to lock and unlock the action.
• Controlled feeding.
• Safe and easy to manually feed a cartridge directly into the chamber and close the bolt.
• Convenient, separate bolt release.
• Coned breech for smooth feeding.
• Shotgun style tang safety.
• Minimal bolt wobble with action fully open.

You will notice that some of these desirable features are mutually exclusive, while others are common to all of the actions described below. Just as with practically everything else in life, bolt actions are based on a series of design compromises and there is no perfect action. Some, however, come closer than others.

I am familiar with most of the popular commercial actions that are widely available in North America, but I'm not familiar with every bolt action in the world, so if your favorite is not included here I'm not implying that it is no good. Many popular actions that are acceptable in a rifle built to a price point would not be the best choice for use in a deluxe hunting rifle. (The Remington 700, Savage 110 and Tikka T3 would be examples.)

Following are descriptions and brief comments about some bolt actions that are among the best, listed in alphabetical order. They all incorporate certain basic features, including receivers with integral recoil lugs, open top receivers, front locking lugs, one-piece firing pins and cock on opening.

Husqvarna HVA

This Swedish made, modified Mauser 98 action was discontinued around 1970. Most of the modifications were made to simplify production and represent a step backward from the original Mauser design, but the changes were minor. These Include a very positive but difficult to operate spring steel magazine floorplate release in the front of the trigger guard and the lack of an external bolt release. (You remove the bolt by pressing down the receiver mounted pivoting ejector, which protrudes from the edge of the bolt face when the bolt is fully open.) Unlike a Mauser 98, but like most other bolt action rifles, the magazine box is separate from the bottom iron.

The safety is a slider mounted at the right rear of the action. It locks the trigger but not the bolt, which can be opened with the safety on.

The Husqvarna action is very precisely machined from top grade steel. It handles escaping powder gasses as well as any other Mauser pattern action. It is one of the slickest, perhaps the slickest, Mauser 98 pattern action that I have ever used.

Other positive features include a one piece bolt, one piece firing pin, flat bottom receiver with integral recoil lug, adjustable trigger, one piece bottom iron, generous loading/ejection port and full length extractor for controlled feeding. Like all Mauser 98 style actions, the Husqvarna's full length extractor takes a very large 'bite' on the case rim for positive extraction of dirty, oversize, or stuck cases. If you can find one, the Husqvarna is a very fine action and an excellent choice around which to build a custom rifle.

Mannlicher-Schoenauer

The 1903 Mannlicher rifles and carbines were the last designs of Ferdinand Ritter Von Mannlicher. The Model 1903 was the first of the famous Mannlicher-Schoenauer Rifles and Carbines and established the basic design of all the models that were to follow, including the variations introduced in 1924-25, 1950, 1952, 1956, and 1961. The Mannlicher-Schoenauer ultimately became too expensive to profitably manufacture and was discontinued in 1972.

All models came with a flat 'butter knife' bolt handle that is located well forward of the trigger guard. (The bolt handle was swept rearward starting in 1952.) The flat Mannlicher bolt handle does not stick out to the side as much as conventional bolt handles with knobs, making the rifle particularly suitable for carry in a saddle scabbard or slung over the hunter's shoulder.

The M-S action has a split rear receiver ring through which the bolt handle passes as it is drawn back. The split rear receiver helps to prevent bolt wobble when the action is opened, but was to cause trouble later, when the use of telescopic sights became widespread, as it prevents the use of most conventional scope mounts on top of the receiver. Redfield designed a top mount specifically for the M-S and this style mount is still available from the aftermarket. However, most scoped M-S Rifles and Carbines are fitted with side mounts. Bolt rotation is approximately 90-degrees.

Cartridges were fed from a Schoenauer spool magazine (hence the name Mannlicher-Schoenauer). This spool magazine is arguably the finest, strongest and most reliable cartridge feeding system ever incorporated into a bolt action rifle. It was also probably the most expensive to produce. The spools were different for every cartridge and cannot be interchanged between similar calibers (.270 and .30-06, for example). Instead of a hinged floorplate, a button allows all cartridges in the magazine to be ejected from the ejection port, achieving the same result.

M-S rifles and carbines came with the buyer's choice of a user adjustable double set trigger or a single trigger. Either is a joy to use, light and crisp; the double set trigger almost unbelievably so.

In 1952 the M-S Carbine was improved by the addition of a swept back bolt handle and a couple of holes tapped into the flat above the bolt release on the rear receiver ring to accommodate a scope base. The gentle curve of the pistol grip was tightened somewhat.

The all forged steel Mannlicher-Schoenauer bolt action was the simply the smoothest ever made. It is the only bolt action that I know of that will close and lock itself if the muzzle of an empty rifle with a fully open bolt is swung down to point at the ground. This is partly because of the outstanding machine work put into these rifles and partly because the Schoenauer spool magazine does not drag against the bolt, as does the follower in the box magazine of a Mauser style rifle.

The M-S action is not perfect, however. The forward location and unusual shape of its bolt handle slows operation for some users, it is not as strong as some competing bolt actions and its lock time is leisurely by comparison to a Mauser 98 and most modern bolt actions.

Commercial Mauser Model 98 (as manufactured by Mauser Werke, FN, etc.)

Regarded by many experts as the finest bolt action ever designed, the Model 1898 was Paul Mauser's classic design. This is the action upon which most modern bolt actions are based. It is not perfect, as its bolt throw is 90-degrees, the bolt wobbles when fully withdrawn and there are stronger actions available. (Especially the best of the modern push feed actions.) Unless modified by a competent gunsmith, the full-length extractor is not beveled, which prevents loading a cartridge directly into the chamber.

However, commercial Mauser 98 actions offer an impressive number of positives. Included are a one-piece forged bolt with two front locking lugs and a rear safety lug, flanged bolt sleeve, one-piece firing pin, flat bottomed receiver with an integral recoil lug, one-piece bottom iron and magazine box with a hinged floorplate, a very handy floorplate release located inside the front of the trigger guard, external bolt release, controlled feed with a full length extractor, receiver mounted fixed ejector and a large loading/ejection port. The Model 98 also handles gas escaping from a blown case safely, routing it away from the shooter's face.

Military Mauser 98 actions can be identified by a dovetail cut in the rear receiver ring for loading by stripper clip. They have positive, but awkward, 'wing' safeties mounted on the rear of the bolt. These will not clear a low mounted scope (nor will the military bolt handle). Military Model 98's also came with two stage triggers.

However, most commercial Mauser 98 actions come with adjustable, single stage triggers. They usually have a two position safety mounted at the right rear of the receiver, or a top mounted shotgun safety.

The Mauser's fixed, receiver mounted ejector flips fired cases from the action when the bolt is near the end of its rearward travel. The speed with which the bolt is operated determines the force of ejection. Operate the bolt rapidly and cases are thrown well clear of the action; operate the bolt slowly, for example when shooting from a bench rest, and the case can be deposited neatly in your waiting hand.

In terms of quality and reliability, the Mauser 98 action is excellent. It remains one of the best bolt actions for hunting dangerous game, the highest praise that can be given to a hunting rifle.

Nosler M48

As Nosler admits, their M48 was designed to incorporate as many of the best features of existing bolt actions as possible. It is not a ground breaking design, but it is an excellent push feed action.

It uses two large, front locking lugs of the Mauser pattern, which means a 90-degree bolt rotation. Nosler uses a guide rail slot in the right hand locking lug, which, along with tight tolerances, minimizes bolt wobble. A substantial extractor of the AR15 type at the front of the bolt gives a good bite on the case rim to yank fired brass from the chamber and a plunger ejector in the fully recessed bolt face reliably kicks it clear of the action.

The one-piece, cast steel bolt is CNC machined and incorporates shallow longitudinal grooves (fluting) to reduce friction during operation. The bell-shaped bolt knob is checkered. Should gas escape from a fired cartridge, it is vented into the magazine well and away from the shooter's face. The steel bolt shroud is small, tidy and prevents escaping gas from flowing around the one-piece firing pin into the shooter's face.

The sturdy receiver is machined from a steel billet with an integral recoil lug. The open top loading/ejection port makes cartridge handling easy. The tops of the receiver rings are contoured to accept any two-piece scope bases designed for a Remington Model 700, the most popular of all bolt action rifles. This makes it very easy to find scope bases.

The adjustable, single stage trigger is free of creep or excessive over-travel. The two-position, short throw safety lever at the right rear of the receiver is low, easy to operate and quiet if released carefully. It does not lock the bolt to prevent inadvertent opening, but allows removing a chambered cartridge with the safety on.

The bolt release, inletted into the left rear of the receiver, is a small, streamlined push button that is both unobtrusive and easy to use. It is one of the best of its kind.

The internal box magazine holds four standard (.30-06) size cartridges in a staggered stack. Cartridge loading and feeding is very smooth and easy. The one-piece trigger guard / bottom metal incorporates a hinged magazine floorplate. The floorplate release is mounted externally in the front base of the trigger guard. The trigger guard itself is sculptured to be wide (for maximum protection) on the bottom and narrower at the front and back, an excellent design.

The Nosler M48 is a first class, high quality action, smooth and reliable in operation. It is about as good as a push feed action with dual front locking lugs can be. It serves as the basis for the hand built Nosler rifles and has achieved an excellent reputation in use.

Weatherby Mark V

When Roy Weatherby designed his turn bolt action he departed from the established norm in many ways. He decided to address the issue of bolt wobble and largely eliminated the problem by making his one-piece bolt as fat as the receiver rings. The locking lugs are machined into a reduced diameter bolt head. Instead of two big front locking lugs, he used three rows of three small lugs, reminiscent of some artillery pieces, making a total of nine locking lugs spaced to give a bolt rotation of only 54-degrees. The bolt body is fluted to reduce friction and bearing surface during operation.

Because the fat Weatherby Mark V bolt is so smooth in operation and has a short rotation to unlock and lock, it is one of the fastest of all bolt actions for follow-up shots. The bolt knob is a large, smooth, comfortable ball. Inside the bolt is a massive, one-piece firing pin.

The cartridge head is enclosed in 'three rings of steel' (barrel, receiver ring and recessed bolt head), made famous by Weatherby advertising. This action is immensely strong. The Mark V is probably the strongest bolt action in the world.

The extractor is a short, but sizable, claw mounted in the bolt head and there is a plunger ejector in the bolt face. The latter is actually more reliable than the fixed, receiver mounted ejector of the Mauser 98 type, as it is practically impossible for it to be bent or damaged.

In the event of a blown case the Mark V handles escaping powder gasses extremely well. There are three gas vent holes in the bolt body and a machined steel bolt shroud completely encloses the end of the bolt to keep powder gasses out of the shooter's face.

There is no separate bolt release. To remove the bolt, hold back the trigger.

The highly polished and finished receiver is machined from a block of solid steel. It has a flat bottom and incorporates a serious recoil lug. There is also a generous loading/ejection port and, typical of push feed actions, a cartridge can be fed directly into the chamber and the bolt closed.

The steel magazine floorplate is hinged at the front and the magazine floorplate latch is a button located in the front of the trigger guard. This button is easy to depress, yet takes a serious grip on the floorplate to prevent inadvertent opening under magnum recoil.

The Mark V comes with an excellent, user adjustable, trigger mechanism. Its two position safety locks the bolt closed and was designed to operate in near silence to avoid spooking game. There is a visible cocking indicator below the bolt shroud.

The 9-lug Mark V is a heavy action, basically designed for Weatherby magnum cartridges. Weatherby subsequently addressed this by the introduction of a considerably lighter 6-lug (two rows of three) action for standard calibers.

Weatherby's Mark V is probably the best of the modern, push feed bolt actions. It lacks controlled feed, but offers great strength, smoothness, fast operation and very high manufacturing quality. It is one of the all-time great bolt actions and it was designed from the outset for a hunting rifle. For hunting the most dangerous (Class 4) game I'd probably prefer a controlled feed action, such as a Mauser 98 or Winchester 70, but for most other purposes I'd take a Mark V.

Weatherby Vanguard

Weatherby showed Howa of Japan how to make a superior, modern bolt action and they learned the lesson well. The Vanguard is a heavily modified Mauser pattern action that incorporates as many Weatherby Mark V features as possible. Its Mauser heritage shows in its small body bolt, dual opposed front locking lugs and 90-degree bolt rotation.

Vanguard features common to both Mauser 98 commercial actions and Mark V include a flat bottom, forged and machined steel receiver with an integral recoil lug, generous loading/ejection port, one-piece bolt, one-piece firing pin and hinged magazine floorplate. The release for the latter is mounted externally in the front of the trigger guard.

From the Mark V action the Vanguard action derives its fluted bolt body, round bolt knob, three gas escape vents in the side of the bolt, extractor, ejector, cocking indicator, sporter safety and a streamlined steel bolt shroud that completely encloses the rear of the bolt. Older Vanguards had a two-position safety that locked the bolt closed, while the Series 2 has a three-position safety. Like the Mark V, the Vanguard is a push feed action.

Original Vanguards featured a single stage trigger, while the Series 2 has a modern two-stage trigger to satisfy the Company lawyers. In either case, the trigger is user adjustable and allows for a clean, creep free release without excessive over-travel.

Like the Mark V, cartridges may be fed directly into the Vanguard's chamber and the bolt closed. The bolt face is recessed to enclose the head of the cartridge.

The Mark V may be faster, smoother and even stronger than the Vanguard, but the Vanguard is a strong, well designed and well made action in its own right. It offers remarkable quality at a reasonable price and has served nicely as the foundation of many custom-built hunting rifles. Hunters looking to acquire a custom or semi-custom rifle based on one of the medium priced, push feed bolt actions (Remington 700, Savage 110 or Weatherby Vanguard) would be wise to choose the Vanguard.

Winchester Model 70 (Controlled Feed)

No less an authority than Jack O'Connor, the Dean of American gun writers, wrote that the Winchester Model 70 was one of the two best bolt actions in the world (the other being the Mauser 98). The pre-'64 Model 70 lacks the one-piece bottom iron of the Mauser 98, but the latest versions have rectified this. The magazine floorplate release latch is at the front root of the trigger guard, a less convenient spot than the inside trigger guard location of the Mauser 98. The magazine box of a Model 70 is separate from the bottom iron.

On the other hand, the Model 70 has always been built from the finest alloyed steel. It is one of the few actions that incorporates a coned breech for ultra-smooth and reliable feeding, definitely a desirable feature.

There is also a superior three position safety mounted on the right rear of the bolt that blocks the firing pin, trigger and locks the bolt closed when fully rearward. In the middle position it blocks the firing pin and trigger, but permits the bolt to be operated for unloading. The third, fully forward, position is 'fire.'

The flat-bottomed Model 70 receiver is machined from steel billet and incorporates an integral recoil lug. The one-piece bolt body is also machined from a steel billet, but the bolt knob is a separate piece. There is a small cut in the right bolt lug and a bolt guide rail in the receiver to reduce bolt wobble. The bolt release is a small, tidy catch at the left rear of the receiver, easy to use and far neater than the Mauser 98 bolt release.

The full-length extractor is beveled to permit single loading a cartridge directly into the chamber if necessary. A receiver mounted ejector flips fired brass from the action as the bolt nears the end of its throw. As with a Mauser 98, the ejection force depends on how fast the bolt is operated.

All Model 70 trigger mechanisms are single stage and fully user adjustable. The latest M.O.A. version is one of the best factory triggers on the market.

The bottom iron, magazine floorplate and trigger guards of Super Grade Model 70's are fabricated from blued steel. These parts are made of anodized aluminum to save weight on Featherweight models.

Otherwise, the Model 70 and Mauser 98 pretty much share the same collection of positive features and the question of which is superior will probably never be definitively resolved. As O'Connor wrote years ago, these two actions are at the top for hunting rifles and particularly for dangerous game rifles.

The Weatherby Mark V is a centerfire, bolt-action rifle manufactured by Weatherby of Sheridan, Wyoming^[2]. The rifle was introduced in 1957 by Weatherby and was designed to safely contain the high pressures associated with the Weatherby line of high performance cartridges. It is the flagship rifle of the Weatherby line of firearms.

The Weatherby Mark V rifles are considered prestigious or luxury firearms by many. This is due in part to Roy Weatherby who presented the rifles to royalty, politicians, gun writers and actors including Prince Abdorreza Pahlavi of Iran, Generals James Doolittle (USAF) and Chuck Yeager (USAF), Jack O'Connor, Warren Page, Elgin Gates and Lorne Greene and was able to use this fact as a marketing tool.

Early development[edit]

Ever since Roy Weatherby began manufacturing rifles he had to rely on a third party to provide the actions for his rifles. Beginning in 1949 Weatherby began building his rifles around the FN Belgian Mauser action. In 1955 Schultz & Larson actions were added to the mix while adding the Mathieu left handed action to his rifle action line up. With the addition of the large capacity .378 Weatherby Magnum a new action type was warranted so the Brevex Magnum Mauser action was added. A little later the FN Sako Mauser actions were added to action types used by Weatherby to build his rifles.^[3]

Roy Weatherby had been disappointed by the length of time that was taken discussing and negotiating before coming to an agreement with his European manufacturing partners. With five European companies supplying actions, the frequent trips made to Europe left him little time to run the day-to-day business operations in South Gate, California.^[4]

Roy Weatherby had found the Mauser-type wanting due to the case head not being completely enclosed and supported within the breech. While these action types could easily withstand a high pressure of about 70,000 C.U.P, he felt that one which would have the capability of handling 200,000 C.U.P. would fare better with the Weatherby line of cartridges. He had been aware that many handloaders were overloading their cartridges seeking higher performance, which was resulting in blown primers and ruptured case heads. This in turn would lead to hot gases making their way through the bolt and into the shooter's face and eyes and causing injuries to his customers.^[3]

Weatherby's requirements included a bolt face which was countersunk into the bolt which would enclose the cartridge's case head while the bolt head was enclosed in a counterbored barrel breach, which in turn would prevent the case head from rupturing. If a rupture should occur, the bolt would have holes through which hot gases could be vented safely towards the side and away from the shooter's face. Further as an extra safety measure he required an enclosed or shrouded bolt sleeve that would prevent the hot gases from making their way through the bolt mechanism to the shooter's face. To Weatherby, the safety and strength of the design were paramount.^[4]

The Weatherby Mark V action uses an interrupted screw breech as used on many artillery pieces. The nine lugs are actually sections of a screw thread. The bolt cams forward slightly as the bolt is closed following the pitch angle of the screw thread.Weatherby designed the action type with nine locking lugs arranged in three rows. It was determined early on that these lugs would not protrude outside the bolt but would be of the same diameter as the bolt body itself. Such a design would be conducive to a smooth fluid movement of the bolt through its feeding and extraction cycles.^[3]

In spring 1955 Weatherby demonstrated his new action at the annual NRA meetings in Washington, D.C. The action type was shown to Burt Munhall of H.P. White Ballistics Laboratory and to General Julian Hatcher to elicit their opinion of the design. Both were impressed with the design and encouraged Weatherby to commercialize the action as soon as possible. At this time Weatherby had been looking for someone to provide the technical design, drawings and specifications for the design of his new action. General Hatcher suggested that John Garand (of the M-1 Garand rifle fame) would be suitable for the job. However, when contacted Garand expressed disinterest in the project as he was enjoying his retirement.^[3]

Walter Howe, the editor of the American Rifleman magazine suggested the Mathewson Tool Company of New Haven which had worked with Winchester, Remington, and the U.S. government designing and building prototypes. While Dave Mathewson managed to build and deliver the design details, the prototype did not include all the features which Weatherby had required, while taking longer than anticipated to provide the prototype design.^[4]

It was not until 1957 that the first prototype rifle was built. This was the fifth design model of the rifle as four previous designs had been abandoned. The rifle was shown to Elgin Gates who suggested that the rifle be named the Mark V. This fifth prototype was designed and built with the assistance of Fred Jennie, an engineer hired by Roy Weatherby. It was more streamlined and had a more simplified trigger and safety which would lead to lower manufacturing and tooling costs.^[4]

In 1956 Weatherby visited Europe in an attempt to find a supplier for the Mark V action. Steyr-Daimler-Puch, which had been manufacturing the Mannlicher rifle, was eager to work with Weatherby, but the high cost of the initial tooling charges of $200,000 was found to have been too excessive. Schultz & Larsen, which had been building the .378 Weatherby Magnum, was also contacted, but due to an anticipated rise in labor costs Weatherby had to keep looking elsewhere. When Sako of Finland, which was working on the FN Mauser action for Weatherby rifles was approached, it indicated that it had a backlog of production yet to complete and that such a project would have to wait for a year and a half. Also, labor costs in Finland had been rising, which would increase the price per unit cutting into profits. The Birmingham Small Arms Company Limited (BSA) of Birmingham was extremely receptive to the idea of building the action and even attempted to absorb the initial tooling costs. However, it was unable to manufacture the action with the nine locking lugs.^[3]

While several companies bid on the contract, Weatherby settled on Precision Foundry Inc. (PFI) of Leandro, California in 1957. It was decided that all major parts would use the investment casting process. Another firm, Gardner Machine Co. of Hollywood, California, would finish all these parts to their final dimensions and Picco Industries of Sierra Madre, California would manufacture the magazine floorplate catch, the trigger sear, and the thumb safety. All the parts thus manufactured would be delivered to Weatherby's South Gate facility where the final polishing, bluing, and assembly would take place. The barrel and stocks were made in-house by Weatherby at the company's South Gate facility.^[4]

Due to the investment casting process and issues with porosity of metal, PFI manufactured actions did not easily accept the high-luster bluing process which was a trademark of Weatherby rifles, which resulted in high rejection rates of over 50%. Furthermore, the delivery of component parts by PFI had been irregular, which led to a backlog of orders.^[4]

In 1957 Weatherby went back to Europe to visit J.P. Sauer & Sohn, which was at the time primarily a shotgun manufacturer. Udo van Meeteren wanted not only to manufacture the action but also the complete rifle as well. Within two months of the visit a contract with J.P. Sauer & Sohn was signed. In 1958 Fred Jennie visited the Sauer plant in Eckernförde, Germany to help with the setup process. At this time it was decided that receiver and bolt would be made from forgings instead of the investment casting process as Sauer was more familiar with the process. Rifle barrels would be hammer-forged by Sauer, which promoted greater uniformity from breech to muzzle and which in turn led to greater accuracy and longer barrel life. By employing this method of hammer-forging barrels, Weatherby became the first U.S. company to offer hammer-forged barrels in the United States.^[3]

In 1970 Weatherby moved production to the Howa factory in Japan. The move was a result of increased costs of production in Europe; Howa was able to make the rifles and at a greater cost savings. The strength of the actions was never compromised—to many, fit and finish are superior to German models and compete well with U.S. models. Howa manufactured Mark Vs until production was brought to the United States in 1994.^[5]

Proof testing of the Mark V action[edit]

Weatherby had intended that the new action would be the safest and strongest bolt action available. The rifle was marketed as 'The World's Strongest Bolt Action'. The Mark V action has been tested to be able to contain up to 200,000 CUP (Copper Units of Pressure).^[6]

The testing of the rifle was conducted on a production rifle chambered for the .300 Weatherby Magnum. Before testing was to be conducted, very thorough measurements of the rifle were taken so as to provide a benchmark for the testing which was to be undertaken.^[7]

The first test was conducted using a 180 gr (12 g) bullet propelled by 82 gr (5.3 g) of Du Pont #4350 powder. This load provided 65,000 psi (4,500 bar) of pressure. This load did not show any pressure or extraction issues with the new Mark V action but caused a slight sticking of the cartridge case in the Mauser style rifle design. Subsequent testing was performed using the same 180 gr (12 g) bullet and using a powder charge of Du Pont #4350 which increased by increments of 2 gr (0.13 g) for each test thereafter.^[4]

The second testing which was conducted with the 84 gr (5.4 g) showed no signs of pressure nor issues with extraction even though the measured pressure was close to 75,000 psi (5,200 bar). Firing this load in the Mauser rifle led to a blown primer and extreme difficulty was experienced in extracting the spent case.^[4]

Using 86 gr (5.6 g) of Du Pont #4350 the cartridge began to show signs of pressure in the Mark V action. However, the case did not stick and extraction was performed easily. Breech pressure was found to be between 85,000–95,000 psi (5,900–6,600 bar). Measurements of the spent case showed that the case had stretched at the belt a mere .0005 in (0.013 mm).^[4]

The spent case from the 88 gr (5.7 g) test led to a slightly sticking case, which in turn led to a slight difficulty in opening of the bolt. Measurements from the case belt showed that the belt had expanded from .533 in (13.5 mm) to .535 in (13.6 mm). The pressure generated by this load was 100,000 psi (6,900 bar).

Weatherby Mark V Serial Number H

The fifth test was conducted used a load of 90 gr (5.8 g) of Du Pont 4350. Firing this load led to some difficulty in opening the bolt, and the case was extracted when opened. The belt of the case still measured .535 in (13.6 mm). A difference in the diameter between the bolt head and the diameter of the barrel of .002 in (0.051 mm) per side was noted. No bulging of the bolt, receiver or the barrel was noted. Headspace was measured to be the same as prior to the testing.^[4]

Further testing was conducted with a 180 gr (12 g) bullet lodged into the throat of the barrel. A cartridge loaded with the standard charge of 78 gr (5.1 g) of Du Pont 4350 and a 180 gr (12 g) bullet was fired into the back of the first bullet. It was found that both bullets exited the barrel. The primer had been pierced and the exiting gas entered into the bolt and hit the firing pin sleeve, which was loosened slightly. The bolt was opened by hand but the cartridge stayed stuck in the chamber. When the case was tapped out, it was found to be in good condition except for its pierced primer. It was found that the barrel, just in front of the receiver ring, had expanded from 1.147 in (29.1 mm) to 1.1496 in (29.20 mm). The diameter of the bolt head had expanded from .7178 in (18.23 mm) to .7190 in (18.26 mm). The head space had increased from .2163 in (5.49 mm) to .2174 in (5.52 mm). All other dimensions had stayed constant. This test was conducted 15 times. A test was conducted with a 220 gr (14 g) bullet lodged into the bore of the rifle and a 180 gr (12 g) grain bullet was fired into the back of this bullet. The result of this test found that the cartridge case head had expanded to .545 in (13.8 mm). After these additional 15 tests it was found that the head space was set back only a mere .001 in (0.025 mm).^[4]

Action variants[edit]

The Weatherby Mark V action has remained virtually unchanged from the original design of Fred Jennie and Roy Weatherby which is a testament to the longevity of the design. Nevertheless, some refinement to the design has occurred over time. The Mark V action is a front locking, push feed, bolt action repeater. The lug arrangement allows for 54° bolt lift. This shorter bolt lift allows for increased clearance between the bolt handle and any accessories such as scopes that may be mounted on the rifle and arguably provides for faster cycling of the action. This compares favorably with the Mauser style rifles which have a 90° bolt lift.

The bolt body, including the handle is made of a single piece of machined steel. To remove any play and reduce any chance of the bolt binding during the cycling of the action, the bolt head is smaller with the locking lugs being the same diameter as the body itself. The bolt has three gas vents along the bolt body which will allow for the venting of hot gases should the case not seal the chamber or if a pierced primer should occur. Shortly after production began in Germany, the bolt body was fluted to provide further positive feeding and extraction of the cartridges.

9 Lug/Magnum[edit]

The 9 Lug/Magnum action was the original design which went into production and was also the design which was subject to the strength testing conducted by Weatherby. The original 9 Lug design lacked the bolt fluting and featured a safety mounted on the receiver. These rifles were made by PFI and J.P. Sauer & Sohn in the early 1960s. The refinements to the original design included a fluted bolt and a redesigned safety allowing for smoother feeding and extraction and a safer design. The 9 Lug action is considered the archetypal Mark V action. The 9 Lug design features a bolt head with nine locking lugs arranged in three rows with each row having three locking lugs. The Magnum Mark V bolt is the heaviest bolt available in a commercially produced rifle.

The 9 Lug Mark V action is currently available in rifles chambered for Weatherby calibers. However, late production Sauer and very early Howa manufactured Mark V rifles in .30-06 Springfield and .270 Winchester were chambered in the 9 Lug Mark V actions. As the production run of these rifles was short such rifles are a rarity and considered collectibles.

Varmintmaster[edit]

Weatherby Mark V Serial Numbers Lookup

In 1963 Weatherby introduced a scaled down version of the 9 Lug design which was made specifically for chambering smaller varmint cartridges. The Varmintmaster was introduced together with the .224 Weatherby Magnum cartridge. The Varmintmaster was also chambered in the .22-250 Remington.

This action featured six lugs arranged in two rows. The 9 Lug design was found to be too large and too long for use with varmint cartridges and this new action addressed this issue. The action features a shorter one piece bolt of a smaller diameter than the 6 Lug/Standard design. The Varmintmaster action was later used in the Weatherby Mark V Silhouette handgun as well.

6 Lug/Standard[edit]

The 6 Lug design has been only available in non-Weatherby cartridges and was offered beginning with the .30-06 Springfield and the .270 Winchester cartridges. Like the Varmintmaster (which predates the 6 Lug/Standard action design) it features six locking lugs arranged in two rows. The bolt is shorter and is considerably lighter than the 9 Lug/Magnum design. Coupled with a narrower receiver, the Standard Mark V action is better suited to most cartridges.

This action type is also used by the Weatherby CFP (Center-fire Pistol) as it provided a greater flexibility as to which cartridges could be chambered. The Standard Mark V action was also used in the Super Varmintmaster rifle rather than the original Varmintmaster action due to cost and production constraints. The Standard Mark V action is only available in rifles chambered for non-Weatherby cartridges.

References[edit]

1. ^'Mark V Deluxe'. Weatherby. Retrieved 6 April 2014.
2. ^http://www.weatherby.com/company/new-headquarters.html
3. ^ ^abcdefWalter, John (2006). Rifles of the World. Iola, Wisconsin: Krause Publications. p. 511. ISBN978-0-89689-241-5.
4. ^ ^abcdefghijkGresham, Grits; Gresham, Tom (2007) [1992]. Weatherby: The Man. The Gun. The Legend(Hardback) (1st ed.). Natchitoches, LA: Cane River Publishing. p. 290. ISBN0-944438-02-4.
5. ^Wieland, Terry (2006). Dangerous-Game Rifles. Down East Enterprise Inc. p. 106. ISBN978-0-89272-691-2.
6. ^Hawks, Hawks. 'Compared: Mannlicher-Schoenauer and Weatherby Mark V Deluxe Rifles'. chuckhawks.com. Retrieved 25 June 2011.
7. ^Van Zwoll, Wayne (2004). The Hunter's Guide to Accurate Shooting: How to Hit What You're Aiming at in Any Situation. Globe Pequot. p. 55. ISBN978-1-59228-490-0.

Weatherby Mark V Serial Number

External links[edit]

Weatherby Mark V Serial Number H138799