take, shtf, you will not. If you don't HAVE to shoot, it's stupid to fire at ALL, when you have no help to call upon, no safe base to run and hide in, no chopper for insertion-evac. since you will HAVE to shoot, you can EXPECT the target to be moving, partially-covered, wind and mirage to be bad, fog, snow, rain, etc to be part of the equation (very often) and you will be exhausted, depressed, starving, dehydrated, and dysentric. all of which of course means, u'd better get TWICE as closea firing distance as you now IMAGINE you can hit-at. Which means WELL within 223 AR range.