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The term is caliber (in Britain, caliber). It refers to the size of the projectile (the bullet) and is given in terms of a fraction of an inch. a .50 caliber machine gun fire a bullet that is ABOUT 0.50 inches in diameter, a .22 fires a bullet that is ABOUT 0.22 inches in diameter. With cannon or naval guns, it refers to the ratio of the length of the barrel to the bore diameter. A Naval 5 inch 38 caliber gun fires a shell 5 inches in diameter from a barrel 15.8 feet long (38 x 5)

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11y ago

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