Oh, to heck with it -- I'm gonna invent the .39 Gored Ox, which will actually be 9.9 mm and have terminal ballistics at the mean value for all the rounds between .38 Special and .45 ACP.* Just 'cos. And so there can be even more moaning and whizzing in the wind.
Is gun. Is not safe. All of those rounds hurt. None of them is a sure, 100% one-shot stopper, so, you know -- try to avoid having to do that. And train well and thoroughly in how, when and why, so if you have to use it, you'll do it right.
There's a reason for that little cluster of handgun calibers and ballistics from around 3/8" to a bit over 7/16" and it mostly has to do with controllability, not "stopping power." Might be a lesson in that.
* Possibly not the .44 Magnum, 'cos I have been hit on the palm with a softball bat already. Ow.
5 months ago