Bulk 45 ACP Ammo

The Bulk 45 ACP Ammo (Automatic Colt Pistol) or 45 Auto (11.43×23mm) is a rimless straight-walled handgun cartridge designed by John Moses 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.