+1 to using whatever you want and can shoot well. Most of the guys I hunt with have "the" gun they hunt with no matter what critter we are hunting. These range from .257 Roberts to 270 to -06 to 7mmMag. Depending on what we draw in a given year, that particular round may be slightly under-gunned, slightly over-gunned, or "just right". But everyone can shoot their rifle well and has faith in it.
My buddy's mom killed a monster bull elk with her .257 Roberts - perfect shoot through the pump house. Before that, I would have "tsk-tsk"'d that round for elk. The guy who shoots the 7 Mag is "over-gunned" for blacktails if we end up hunting west side, but when he pulls the trigger there is an animal on the ground.