For many years the Weatherby Mark V rifles chambered in .460 Weatherby were equipped with Pendleton muzzle brakes to help alleviate the effects of recoil. The Pendleton muzzle brake is an integral braking system installed by porting the rifle barrel and once cut into the barrel cannot be reversed. All current Weatherby Mark V rifles chambered for the .378 Weatherby Magnum and its derivatives are provided with the Accubrake as a standard accessory with the rifle package. The Accubrake reduces felt recoil by about 53%. Unlike the earlier Pendleton muzzle brake, the Accubrake is a removable, screw-on type brake. The use of muzzle brakes is frowned on by the hunting community in particularly in guided hunting situations involving dangerous game. Since the Accubrake is a removable accessory, it can be reserved for sighting in. According to Weatherby, the removal of the Accubrake will not change the point of impact.