pappilon wrote:That would be the .380 aka Browning 9mm?
Oh, and PS the .40 cal 10mm difference is more akin to the .38 police special and the .357 Mag. The .40 is for antipersonnel the 10mm is more for protection in the brush. Unless you really enjoy firing off 50-100 rounds of .50 S&W or .44 mag. Frankly my wrist hurts enough after 20 rounds.
I think he was referring to the .45ACP. Although, JMB (BBHN) is responsible for developing all of the 'ACP' (Automatic Colt Pistol) rounds, so there are several candidates. Along with obscure rounds like the .50BMG.
Not that there's anything wrong with .380ACP.
It, like it's slightly longer cousin the 9mm Parabellum, makes a fine hide out gun and is useful to the old, infirm, small statured, petite women, children, the injured and those that just aren't willing to learn how to handle a gun chambered for a full sized cartridge.
The differences between the .40 Slow and Weak and the 10mm are a lot more than you are making out. They share a common bore diameter and that's about it.