9mm = .355 40 cal = .40
The caliber for one.
Short answer, a 9mm is smaller in diameter and lighter.
The .40 caliber fires a larger, more powerful cartridge than the 9mm. which is about .35 caliber. Minor additional info: Many models of pistols that are available in 9mm or .40 are otherwise the same, except for caliber. For instance, a Glock 19 and a Glock 23 are the same exact guns, but the 19 is a 9mm and the 23 is a 40...the 23 holds 2 less rounds.
The .40 is a larger diameter round. The projectile has a dimension of .4005, versus the 9mm Parabellum, which has a dimension of .356. Of the two, the .40 is the more powerful cartridge.
@ .05 inches
the 40 cal is a little bigger then the 357
No
No, 9mm
the maker.
9mm will have the least kick, follwed by the 40, then the 357.
The .40 is larger in diameter and (normally) has a heavier bullet.
No. 9mm and .40 are not interchangeable.