On an electronic timer, now, average of 5 tries, each time to get a hit on the chest at say, 10 ft. from under a shirt, not some bs about an open jacket that you often can't have.. I and a very few others, can average sub 1.0 second. Most people are 2.0 seconds plus. Since a good man can get 6 more hits in the 1 second difference, or dot both of an attacker's eyes with a .22 in 1 second, it seems a bit silly to worry about any "group" type accuracy, or power level in the ammo, when you dont even care about being the first to get a hit. If you get your gun out and "on" him fast enough, he'll often flee, saving you a year of court, $50,000-1/2 mill$ in lost work, having to move, provide protection for your family, legal fees, bondsman's fees, etc. This is on top of the advantages if you actually have to fire and the speed of draw increase is basically free, attainable with dryfire, or with Airsoft.