.45 ACP Handgun Ammunition or .45 Auto Handgun Ammunition 230 grain on sale now. The .45 ACP cartridge (Automatic Colt Pistol) or .45 Auto (11.43×23mm) is a handgun cartridge designed by John Browning in 1904, for use in his prototype Colt semi-automatic pistol. After successful military trials, it was adopted as the standard chambering for Colt's M1911 pistol, being named .45 ACP.
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