The 1903-A3 Springfield, because when one is all alone and without supporting arms and indirect fire support, distance, accuracy & power is your friend.
I think your screen name described your motivation behind that comment. The title of the thread is MINUTE MAN rifle, not zombie rifle. Minute men were militia, a.k.a. defenders of the nation who wouldn't shoot other people because they were moving.shoot anything that moves
I plum forgot my 870 "boom stick"!
Think "head shoot" as the opposition may well be wearing body armor...
Of course thumping 'em with a 12g will still put 'em out of action for a bit....