.303

 is a Fallout Tactics ammunition type.

Weapons using this ammunition

 * M-14
 * Bren Gun
 * Lewis MKII

Behind the scenes
The .303 round was adopted by British forces in the late 1880s, originally as a black-powder cartridge. This round remained the British Army's primary rifle cartridge until the mid-1950s, when it was phased out in favor of the NATO standard 7.62x51mm round.