Muzzy has always worked fine for me for anything in North America. It's just when you get to the extremes on big game animals when you really want to know what is proven.

Below is a little research I did on a Muzzy 145 grain. It speaks for itself. The muzzy was shot out of a 70# Parker Bow, 32 inch draw. It was shot at a piece of cast iron, the head below that was shot the same way, it was a 135 grain head (I'll keep it nameless):