Personally I look for a round designed around 200 grain bullets before I will accept it as a deer round. Then they don't take to many steps after the shot.
If you feel that you need 200gr to kill a deer properly,what do you feel is appropriate for elk and moose?600gr?800gr?
I have killed far too many of our large bodied Canadian deer with 100gr to 140gr bullets to give your statements any credibility.