.303 British

The .303 British is a .311-caliber rimmed rifle cartridge that was introduced in 1888 as a blackpowder load with a 215-grain, jacketed, round-nose bullet. In 1891 black powder was discontinued in favor of smokeless cordite. The WWI Mk VII version used a 174-grain, FMJ spitzer at 2,440 fps. This bullet yawed significantly in tissue and was very effective. The now obsolete .303 was used throughout the British Commonwealth until the mid-1950s in Vickers Machine Guns.