Citing a report from the 1930's?!
Given advances in computer-aided design and manufacturing, simulation testing, bullet designs and firearm powders -- applied to both munitions and firearms -- I don't see how a study from the 1930's could possibly be relevant today, but it is an interesting historical reference.
Several people have commented and I think its inescapably true that shot placement is the most critical factor regardless of caliber, but given good combat accuracy the larger the caliber the better. I personally carry .380, 9mm and .45 depending on threat level, climate and social situations. I'm trying to get good training and to practice responsibly so that whatever caliber I'm using I'll employ it wisely and effectively. I hope I never have occasion to use a defensive firearm but if I do also hope that training and practice will make the difference.
Last edited by usabilityfirst; September 12, 2012 at 04:54 PM.
Reason: more bloviating