Say, on a 10" vitals-circle, at 10 ft, with full charge ammo, using your ccw gun? I recommend that you not use anything with which you can't beat .25 second, because any punk with a .22lr autoloader can do that well. There could easily be more than one of them firing at you, too. Most shots in combat miss the target entirely, and most hits are poor ones. Repeat hit speed is vital, and many types of guns and loads make it very hard to attain. For instance, airwt .38 snubs, 357 snubs, .44 Special snubs (alloy frames) .40 cal pocket autos.