As a straight-walled pistol cartridge, the .380 ACP (Automatic Colt Pistol) was designed by John Moses Browning in 1908 for Colt. To be used in their new Colt Model 1908 semi-automatic, the .380 ACP has been a popular round ever since. Also referred to as the .380 Auto, 9mm Corto, 9mm Browning, 9mm Kurz, 9mm Short, or 9x17mm, the .380 ACP was designed to be totally rimless. The Armory stocks a wide range of 380 ammo to satisfy the needs of plinkers, hunters, competitive shooters, and the avid ammunition aficionado. Being avid shooters ourselves, we enjoy trying out new 380 Auto (ACP) ammo and try to offer you 380 Auto (ACP) at very aggressive prices so that you can share in our most favorite pastime.