Re: which caliber for all around use?
I took a grouse with my M1A last year so there's a funny example of how .308 can be used for everything big AND small! got a neck shot on him so I didn't ruin any meat either. Lots of folks using .308 for elk and other large game with no problems at reasonable ranges. It's what I'm using this season for all big game, bear, cougar, deer and elk.
AK round is just not in the same league as the other two.
"Loud noises don't end gunfights.... well placed shots do."