by Pat Cannon on Thu Jan 03, 2008 12:57 pm
The answer is: you should try various loads yourself under simulated self-defense conditions, and use the most powerful round you can shoot with what you consider adequate accuracy under those conditions. Or to put it another way, I don't know.
There are rounds such as .38 Special round nose bullets which almost everybody will agree are not adequate. On the other extreme there are the 180 grain hard cast full-power hunting loads which almost everybody will agree are excessive, for reasons both of control an overpenetration. But everything on the scale in between seems to have its fans. You can do a search on the Web as whole and in particular on forums like The High Road and find hours and hours worth of reading.
How tolerant of recoil are you? Recoil varies a lot depending on the weight of your gun: is it a 25 oz. Ruger SP101 like mine, or one of those 12 oz. space-age alloy guns? A round that is comfortable in the former is like having a firecracker blow up in your hand in the latter (I know, I've tried all three).
How concerned about penetration are you? Do you live alone in a remote farmhouse, or in an apartment with dozens of kids in neighboring apartments?
I have no professional expertise, but I've been researching this myself for the last year or so since I started carrying a .357 snub. For what it's worth, I'm inclined toward the high end of the power spectrum, on the theory that no pistol round is really an adequately reliable instant-stopper. I currently carry Double Tap 125 grain Gold Dot jacketed hollowpoints. Some people feel the noise and flash of a full-bore Magnum is going to be disorienting to the shooter, especially indoors in low or no light, but I figure I'm going to be way more prepared for it than the fellow on the other side of the muzzle. I've said before: I want everybody else on the scene to be crapping their pants, too.