u don't try it at STUPIDLY long ranges. Same thing with firing 2 guns at once. You better NOT bet much that I"ll miss your chest, just because I'm running, diving, etc, when the range is 6 ft or less.
6 ft covers well over 95% of civvie defense, since 90% doesn't require hitting anyone with a bullet, and well over half of the time, the attacker has no gun, ergo, no need to fire beyond 6 ft.