Posted On: 10/21/11 By: William
.380 ACP (9mm Short, 9mm Browning, 9x17mm) is not the same as 9mm Luger (9mm NATO, 9mm Parabellum, 9x19mm). The bullet diameter is almost exactly the same, but the cartridge cases have a 2mm difference in length. Also, the case head diameter is different, and the method by which each cartridge headspaces is different. 9mm ammo is loaded to much higher pressures, as well. It is impossible to chamber 9mm ammo in a .380; the reverse is possible, but not advisable.