I would go with the .270 Wth. with a good bullet loaded toward the top, you should be able to hold on the top of an elk's back and still drill him in the chest at 400 yards..A Nosler Partition is the answer to your bullet needs..the 7mm mag. is a very popular caliber in this area due to the chance for a longer poke..now worries about serious drop until you get well beyond 400 yd..As for killing and elk, my best pals son dropped one last Nov. at a lazered 604 yards, one shot, with a 7mm Mag. and 140 grain Balistic tip..He shoots often and knows his rifles..a .270 Wea. is not that different..
