For those of you who aren’t familiar with the legendary M1911 single-action semiautomatic pistol and its .45 ACP (Automatic Colt Pistol) cartridge, it became the U.S. Armed Forces ...
45 ACP (Automatic Colt Pistol ... After the transition to smokeless powder, it fired a 150-grain lead bullet at a muzzle velocity of 770 fps for a muzzle energy of 195 ft.-lbs.