The AR's are illegal to hunt with for big game in most states. The bullets are too damn small for hunting anything larger than small game. The others however, are legal hunting rifles, and aren't any larger than most standard hunting rifles. The Springfield and Garand shoot the 30-06. The SKS shoots the smaller 7.62x39. The Mauser shoots an 8mm, which is a slightly shorter round, and a little less of a performer, than the 30-06. None are really overkill, unless you shoot 20 rounds to kill one deer...
I use all mine for target shooting and collecting. I have a 30-30 for hunting.
All will be used to defend the right to keep and bear arms, if necessary...