Anyway, the best study I’ve ever come across would be “An Alternate Look at Handgun Stopping Power” by Greg Ellifritz.
And it’s bottom line is a lot more murky, and shot placement notwithstanding, it seems to be two things: projectile energy and dumb freaking luck. If you gotta shoot someone, use a shotgun or a rifle. Also, there’s almost no difference between .38 and .380, can we stop fighting that fight now? Right, never.