i've hunted the eastern slopes and if there's a grizzly in the area, there won't be any sheep- sheep are a long shot or a really careful stalk - typically when you start, you'll lose them by the time you get where they were- and you end up with zippo- again, best hunted from horseback-again my 308/180 load can take care of both situations, although i'll admit it's being optomistic to ask it to do in a griz- but you use what you've got- and griz encounters when hunting other things tend to be short, fast, and ugly