Outfitted hunt in Idaho Selway-Bitterroot Wilderness. Day 4, we got a bugle reply and bull was on a ridge with half dozen cows. Moved up twice to close distance as much as possible due to couple of cows watching us; and he had plenty of time to setup prone and wait for broadside shot. 452 yards with 143gr Hammer Hunter (MV 3190 fps) from Weatherby Mark V 280AI. One shot in boiler plate, bull took couple steps backwards then rolled onto his back.