They are the same, but the word 9mm is shorter.
I disagree: when you buy a gun that is 9mm it will be different bullets that you buy- 9mm, ironically, are longer. So yes, a 9mm is stronger.
Please specify whether you mean the gun itself, or the round you intend to be firing.
The .380 IS a 9mm- a 9mm Short (also called 9mm Kurz or Corto). There are more than a dozen different 9mm cartridges. Most people mean the 9mm Parabellum (also called 9mm Luger) when they say 9mm. The 9mm Parabellum IS a longer cartridge than the .380 .
Usually not. The 9mm Parabellum catridge is longer than the .380, as a result, a 9mm magazine is also bigger, and the magazine will not fit in the .380 magazine well.
The 9mm Parabellum is longer than the .380 ACP (also called the 9mm Short) They do not interchange.
While the .380 is sometimes called the 9mm Kurz, it is not the same as the 9mm parabellum (also called 9mm Luger and 9x19). It is shorter than the 9mm.
im pretty sure the 9mm cartrige is bigger than the 380. So the 380 cartrige might not fit inside the 9mm die.
It is A 9mm- a 9mm Short. However, when most people say "9 mm" they mean the 9mm Parabellum, also known as 9mm Luger. That is a different cartridge than the .380.
380 and 9mm ammunition IS NOT INTERCHANGEABLE.
9mm and 380 both use bullets with a diameter of .355. But the answer to the question you're probably asking is, no, you cannot fire a 9mm parabellum cartridge from a .380 handgun. The 9mm cartridge is different than the .380 cartridge. Even though both are 9mm in diameter, the overall cartridge lengths are different.
380 and 9mm ammunition IS NOT INTERCHANGEABLE.
It depends on a couple of factors, but in general, a 9mm is louder because it's a higher pressure cartridge than the .380.
No, the .380 has less power than the 9mm or the .45 .
No! Both of those cartridges are ACP where it uses the mouth of the case to establish proper head spacing and to prevent the round from dropping too far in to the barrel. The cases are of different lengths. 9mm is 19mm (.754in) and the 380 is .680 in. The 380 will drop in to a 9mm barrel, but would be dangerous to shoot. The action of a 380 will not close on a 9mm.