Weatherby guarantees that every Mark V rifle will deliver 1.5 inch or smaller three shot groups at 100 yards from a cold barrel using Weatherby factory loaded ammunition. These famous custom barrels are button rifled and use three different crown configurations. Standard (non-Weatherby) calibers are supplied with 24 inch Krieger Criterion barrels. Weatherby Mark V magnum barrels are hammer-forged with application specific crowns. It is also internally adjustable for sear engagement. It is easily adjusted for weight of pull, without any disassembly, by means of a small Allen screw in the front of the trigger.
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The trigger is factory set for a release weight of four pounds and is commendably clean and free of creep. There is also a cocking indicator at the rear of the bolt so that the shooter can tell at a glance if the rifle is cocked. The safety locks the striker and disengages the sear. The floorplate latch takes a good bite on the floorplate to insure that it stays closed under heavy recoil, and the release is mounted in the front of the trigger guard. The magazine floorplate of Mark V rifles is hinged. Its bolt has 6 locking lugs arranged in pairs instead of nine lugs, but conceptually and in quality it is the same. It is identical to the magnum action in virtually every way except that it is shorter, narrower, and lighter. There is also a newer version of the Mark V action designed for standard (.30-06 size) cartridges. The extractor is a flush-fitting claw at the front of the bolt, and the ejector is of the plunger variety in the bolt face. A Weatherby Mark V Magnum action feels smooth and precise compared to Mauser pattern bolt actions. This means less slop when the bolt is operated than with most other bolt action rifles. The bolt face is smaller in diameter than the main body of the bolt, which is the same diameter as the locking lugs. There are three gas escape ports in the side of the bolt to let gas escape in a safe direction. The one-piece bolt body is fluted and there is a shroud at the rear of the bolt to prevent escaping gas from exiting from the rear of the bolt into the shooter's face in the event of a blown case. The total shear area is much greater than with two conventional lugs, and the arrangement and spacing allows a short 54 degree bolt lift. Instead of two massive locking lugs the Mark V Magnum's forged and machined bolt has nine small ones arranged in groups of three. The Mark V receiver is made from a single chrome-moly or stainless steel forging and incorporates an integral recoil lug. The Mark V Magnum action was designed for maximum strength, and indeed it was billed as the world's strongest action, a title it still claims today. Regardless of country of manufacture the standards of quality, assembly, fit, finish, and accuracy have remained at the same high standard. In 1995 production was moved to the United States. Subsequently, and for many years, they were produced in Japan by Miroku. In the early years the Mark V rifles were manufactured by J. This ground breaking achievement was designed specifically for the high pressures at which the Weatherby belted magnum cartridges operated, and would elevate the Weatherby company to the status of a major player in the rifle business. Roy Weatherby introduced the Mark V Magnum bolt action rifle in 1957.
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