Red Lion, I'll assume you're from the States because you say ammo isn't plentiful It's everywhere in Ontario, and it's dropped it's fair share of moose and deer. My friends (2 of them, and their dads) use'em for moose and deer every year, and if they hit'em, they're usually toast. However, I would rather use a 30-06. The only reason I would use a 303 is because of less recoil.