I;ve studied gunfighting for about 45 years now. I've yet to find a case wherein a US civilian, here in the US, HAD to hit more than 2 guys, in any one incident since the advent of the 1911, and the end of the Indian Wars. Cops have had to do so, on rare occasions, military, more often, but still rare (and live to tell of it) with only a pistol. how many shots you need to stop 1-2 men is a lot dependent upon the distance between you and target, lighting, and use of cover, movement, firing back, stabbing/clubbing you as you fire, etc. I rarely bother to carry more ammo than the 7 rds that are in the pocket auto. I've held men at gunpoint 4x in my life, it's always been at 10 ft or less, and they always froze at the sight of my gun. Many dogs will stop attacking at your change of attitude (once gun is in hand) too.