The .30 Carbine (7.62 x 33 mm) is the cartridge used in the famous M1 Carbine. The cartridge itself is basically a rimless .308 caliber version of the obsolete .32 Winchester Self-Loading cartridge of 1906.Barnes, Frank C., Cartridges of the World, DBI Books, 1975, 1989 While its straight case and round-nosed bullet lead some to believe it was designed for use in pistols, it was designed to be fired from the M1 carbine's 18-inch (458 mm) barrel.