I can tell you this from expierence that the Magnus 3 blade snuffer you mentioned cuts a hell of a hole and its blood trails are better then most I've seen when tracking animals. These heads have worked great on deer, bear, elk, caribou, moose. I've only seen the blood trails from deer, bear, elk, but my hunting buddies that shoot them too tell me the blood trails on the caribou and moose were excellent as well. If a fixed blade gets too wide I would think the arrow flight might get out of wack regardless of a heavy arrow, maybe not but just my thoughts anyway.