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The Mark V® trigger assembly has two socket cap (Allen-type) adjusting screws. The socket cap screw on the bottom of the trigger assembly adjusts for weight and trigger pull, and is for your use. The socket cap screw on the top of the trigger assembly adjusts sear engagement and is for use by Weatherby factory and Authorized Service Center personnel only.

WARNING!! Do not attempt to adjust sear engagement, make any adjustments other than as described below, or modify the trigger assembly in any way. Improper adjustment or modification of any firearm trigger assembly can result in the firearm discharging prematurely due to a “hair trigger,” minor bumps or movement, possibly resulting in serious injury or death. The trigger assembly has been set at the factory for weight of trigger pull appropriate for most shooters. If you require a heavier or lighter weight of trigger pull, adjust as follows:

1. Keeping the muzzle of the rifle pointed in a safe direction and your fingers out of the trigger guard and away from the trigger at all times, unload the rifle as follows:

• Move the safety lever to the forward position to unlock the bolt.
• Raise the bolt handle and pull the bolt to the rear to extract and eject any chambered cartridge.
• Place one hand under the floorplate to catch cartridges to be removed from the magazine.
• With your free hand, press the floorplate release to open the floorplate and remove any cartridges from the magazine.
• Reposition the magazine follower inside the magazine and close the floorplate.
• Visually double check the chamber and the magazine to make sure there are no cartridges remaining in the rifle.

2. Removal of stock is not necessary. The socket cap adjusting screw is accessible through the opening in the trigger guard, just forward of the trigger.

3. To increase weight of trigger pull, with a hex key (Allen-type) wrench of the proper size, turn the bottom socket cap screw clockwise (when viewed from the bottom) until desired weight of trigger pull is established.

To decrease weight of trigger pull, with a hex key of proper size, turn the bottom socket cap screw counter-clockwise (when viewed from the bottom) until desired weight of trigger pull is established.

NOTE: For safety reasons, weight of trigger pull will not be adjusted below three pounds. To determine trigger weight requires use of a trigger scale.

4. After adjusting the trigger to the desired weight, engage the safety and pull the trigger to its limit. Release it slowly to ensure that it returns to the forward position. If the trigger does not return to its position, you have adjusted the trigger pull too lightly.

Two different safe companies manufactured Weatherby® safes. Contact information is as follows:

American Security
11925 Pacific Avenue
Fontana, CA 92337
PH: 1-951-685-9680
Serial # prefix- GS and KS

Fort Knox
993 North Industrial Park Way
Orem, UT 84057   
PH: 1-801-224-7233

There is a list of Weatherby authorized service centers located on this website. We recommend you send it to the service center nearest you.

Weatherby currently manufactures ammunition for Weatherby Magnum calibers only, and has no intentions to manufacture on an ongoing basis standard cartridge ammunition. Weatherby recommends you purchase premium standard cartridge ammunition from a high quality ammunition manufacturer.

NOTE:  Weatherby did produce a small run of non-Weatherby caliber ammunition in 1997. Calibers included: .270 Win., .30-06 Spfd., 7mm Rem. Mag., .300 Win. Mag., .338 Win. Mag., and .375 H&H Mag.

Vanguard® barrel threads are 26mm 1.5 pitch.

• Twist rate (the distance in which the bullet makes one complete revolution in the barrel).
• Bullet length
• Velocity
• Air density

When using steel shot, you should only use stainless steel choke tubes with modified or larger chokes.

TWO BOX BARREL BREAK-IN
This barrel break-in procedure requires two boxes of ammunition to complete.  Start out by shooting one round at a time, cleaning the barrel thoroughly after each round and allowing it to cool.  This process should be followed for a total of ten rounds.

Then take the remaining thirty rounds and shoot ten three shot groups, cleaning the barrel thoroughly after each group and allowing it to cool completely before firing the next group.  Once ten, three shot groups have been fired the barrel is adequately broken in.  At this point the rifle can be sighted in and used.

The Vanguard® bolt diameter is .680.

Twist- the rate of spiral of the rifling. Given as the barrel length required for making one full revolution: i.e., “one turn in ten inches,” etc.
Nosler, Nosler Reloading Guide #6, November 2007

The rate of twist affects which bullets are the most stable in flight.  This then determines the best accuracy for your rifle.

* It is important to note that the rate of twist is determined by the cartridge developer and is usually at the optimum twist rate for stability.