This is a topic with no absolute answer because of so many variables. Last year with my rifle (a custom 7WSM) I let a friend shoot a Rocky Mtn.Bighorn sheep at 1285 yards. the very next shot out of my rifle was 2 weeks later when I shot my Rocky Mtn.Bighorn sheep at 675 yards, 2 shots 2 kills.

Monday I guided a client in on a California Bighorn sheep and watched him miss with 3 shots with the average shot missing by feet not inches at only 350 yards using a fully custom 7-378WBY and the same bullets I use.

Range time, load development,compotent rifle handling, and current weather all play a part