::.45 caliber ammunition
.45 caliber ammunition comprises bullets (approximately 0.45 inch in diameter), first standardized by Colt's Patent Firearms Manufacturing Company in 1872.
The .45 ACP is a cartridge designed by John Browning in 1904, for use in the prototype Colt semi-automatic .45 pistol he also designed. This ammunition also served the M1911 pistol adopted by the Army in 1911.
.45 caliber ammunition sections
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