Fair enough. That's why I asked for everyone's thoughts.You’re not going to make a functioning .45acp auto pistol that will fit in the same envelope as a .380. Just not gonna happen.
The closest thing is the Doubletap .45, which is a two-shot, derringer-type pistol.
So two shots of .45, with severely degraded velocity that may very well retard penetration even with ball ammunition, or 6-7 shots of .380FMJ that will penetrate deeply enough to be effective?
I think I’d lean towards the .380, m'self.