30-06 or 300, thats a toss up as far as killing effectiveness, so id opt for the lower recoil of the 30-06. If you really want more gun than the 30-06, none of the ones you listed offer it, step up to the 338 win. Really its almost like a bigger 30-06, bigger bullet, same velocity, and its probably the ideal elk rifle. It does kick a little though laugh .