If you own a .270Win rifle and can shoot same. Load up the heaviest, fastest, premium bullet that your rifle will shoot accurately and go after your elk. The ONLY situation in which you may be limited, in terms of wishing that you had a Magnum big bore, may be in max range. The .270Win probably needs to be kept inside 300yds, to insure quick, humane kills. Jack O'Connor did kill about every animal in the world with a .270Win and he did not have the advantage of today's premium bullets, that give a 140gr bullet the same killing power for which we used to use a 180gr bullet.