"Accuracy" and bullet placement are of course paramount but if the bullet fails to behave properly after it lands you might have more problems than if you missed completely.
That's a big "if," and one that none of the premium bullet proponents seem to have a handle on. No hands-on experience in other words, just so much hot air, like most of this thread.
Bingo! As it pertains to being a successful elk hunter rifles and bullets are way down the chit that matters list.