If you will zero .270 at 25 yards dead on with 130 grain bullets it will be about 3 inches high at 100 yds. This makes it much easier on you and less expensive. I like to use Federal trophy bonded bear claw 140 grain for elk. Remember the bigger the caliber the heavier the gun needs to be to absorb recoil! Shoot the rifle that you are most comfortable with. recoil on 270 is 14 recoil on 30-06 is 21 big difference. Forget about Holding over or taking bad angle shots. There is nothing worse than wounding an animal and no recovery! Above all be safe!
