.45 ACP (Automatic Colt Pistol) is also called 45 Auto. This cartridge was created by John Browning in 1904. After successful trailing, it became the cartridge of choice for Colt’s M1911 pistol. The standard load for 45 ACP ammo is a 230-grain round-nose full metal jacket bullet that travels at 830 FPS. Shop our selection of 45 ACP ammo available in individual boxes and case quantities. We offer options for training and target rounds. As well as personal defense.