I read an article a few months back that you all might find interesting and I've been trying to find it in my piles of such saved things, but since I can't put my finger on it I'll paraphrase. They did a test using different handgun rounds while hunting, the idea being that a person's reaction to being shot would depend at least partly on what he thought would happen when he got shot, while the deer had no preconceptions. They found that the round itself made very little difference (I think they tested 9mm-.45ACP) The make or break factor was shot placement. The deer shot with 9mm reacted the same as the deer shot with a .45 if the shot was in the same location.

Just thought you might be interested,
Chris. (Glock 27)