I keep seeing all these debates online about which is better for the (sigh) "SHTF" scenario. Most people say 5.56 because of CQB and clearing houses, and for "zombies" (whatever that means) because its lighter and less noise. (I have a 20" ar-15 and out in the open it will deafen me without hearing protection, so a 12" ar-15 for cqb would be even worse, so sound is no argument.) 5.56 and 308 are both deafening without hearing protection What I have to say is that who the heck is going to be going around "house clearing" in that situation or even in any non "shtf" situation? Also CQB? against who? the "zombies"? I dont think people understand what a real life "SHTF" situation is going to be. If it does happen it is most likely going to be the government coming down on us. So all your "battles" are going to most likely be between you/us and cops/governmental agents..not against harmless people roving about looking for food...(maybe these are the so called zombies?) So in a real all hell breaks loose scenario and the unconstitutional police are fighting against the people, I personally am going 308 because of the barriers. Or if I was lucky enough to get out of dodge for the mountains, again 308 for hunting. If I had to "snipe" off bad guys coming from far off..again 308. So for a real "shtf" (not fantasy shtf where you picture yourself as military running around clearing houses) I choose 308 all the way. BUT if all you have is an ar-15, than so what it will work good too. Id go with Hornady 75 bthp as my main load What do you guys think?