Can you fire a 9mm cartrige out of a 380 auto handgun?

Answer 1

There are several types of 9mm cartridges. .380 ACP is the commercial designation in English/Imperial system countries for the 9x17 cartridge (also known as the 9mm Short, and 9mm Kurz). This is the only cartridge which is to be fired from a weapon chambered for it, and other 9mm rounds are notinterchangeable. This includes the 9x18 Makarov, 9x19 Parabellum, 9x23 Largo, etc.

.380 pistols typically use an unlocked breech, which can be done given the generally low chamber pressure produced by the .380/9x17 cartridge. Now, a 9mm Parabellum cartridge would probably not even chamber in a .380, but, if it did and was fired, the considerably higher chamber pressure produced by that round could destroy the gun and cause serious injury to the operator.