In our thought-experiment, we are going to shoot a bad guy (BG) who is posing a deadly threat towards us. We will assume he is reasonably motivated and doesn’t just quit upon seeing our gun. We will assume that our first shot is a mortal wound to the heart (thus subsequent shots are largely irrelevant). We will assume that there are no spinal hits or effective head shots (which, regardless of caliber, would be instantly incapacitating and so pointless to consider).I used to talk a lot about 9mm vs .45...my rationale for carrying a 9mm was the follow-up shots...lotsa bullets delivered in the same timeframe as a few shots. Now I pretty much agree with M.D. Creekwood at the Survivalist Blog:
Common wisdom is that properly adrenalized and motivated individuals can continue to function for up to 15 seconds with a fatally damaged heart. We will also assume that the shooters can both shoot 3 rounds per second (0.33 splits) and their reload times are 3 seconds.
In our first case, we will assume the BG drops in just 5 seconds. In this instance Shooter #1 (1911) will shoot 7 rounds. Shooter #2 will shoot 16.
Personally I think the whole stopping power debate is a load of crap and a waste of time. Get a reliable weapon and learn to shoot. Simple...Key point — when you leave the house, HAVE A GUN WITH YOU! Every time; every day.