Henry .22 LR/L/S for small game (squirrel, rabbit, raccoon, ect.)
Savage model 10fxp .308 for medium game (deer, blackbear, hogs, antelope, ect.)
Remington700 .300win mag for large game (elk, moose, grizzly, ect.)
Remington 870 for birds (geese, duck, dove, grouse, pheasant,ect.)
So I could live with those rules.
Heck, a BAR in .308 would be a great semiauto boar gun. They make them in .300WM also if you wanted a little more heft.