I don’t want to be hit by any of themI carry a 9mm (Glock 43X) daily.
However...that .45 slug to the leg may not kill him or cause him to bleed out, but an old OHP Trooper friend of mine shot a guy in the thigh years ago. It didn't kill him, but it put him down and try as he may, he couldn't stand up because of a shattered femur.
I'm not sure a single 9mm round would do that. Hell, I've seen 9mm rounds that wouldn't put down steel targets.
But...like I said...I carry a 9mm every day without reservation. Well...maybe just a little.
The bottom line is, no pistol round is indeed a one shot manstopper. The only one shot pistol rounds I would bet money on is a magnum round or maybe the 10mm. But what the hell do I know?