You've got brass, bullets, and loads you know. Each rifle is different, but you've got enough experience with .308 to work through your dope quickly. There isn't anything on this continent you can't take with a well placed .308.
Buy a Tikka T3x and top it with good glass that isn't too heavy for humping in the field all day. Work up a 125-grain soft shooter for deer on your side of the continent and some heavy 180s for elk on the other side.
Call it a day.