I will try and Hunt up the article I've seen on that! Thats part of why I carry and Like 1911 in 45ACP, but in truth, I carry a BHP in 9MM, so I don't expect to only use 1 shot, it's a 13 shot mag in that and an 7-8 shot in the 1911, pays to shoot way more than once! Experience is 2 in the chest, 1 in the head, if they get back up? RUNNNNN!
Evan Marshall has written three books on this subject. It gets complicated; it isn't just the caliber. You get different percentages depending on the style of ammo (ball, JHP, wadcutter, etc.), the brand, and even the make of gun. Google "Evan Marshall" and it'll give you a start.
Bottom line; you can't get 100% one-shot stops with any gun that doesn't have wheels on it... But you can come close.
Not that it's gonna change my mind on what caliber to carry, but I've always wondered about these studies......
In all the hits recorded for a given study, where was the point of impact? Seems to me that an accurate evaluation would have to insure that all the hits were in the same place, on the same sized person.