I've always been a bowhunter and don't know a lot about different rounds. I'm going to do some rifle hunts this year. Possibly a black bear this fall and I'm going on a sheep hunt to the Brooks in August. The sheep hunt is really what I need advice on. I am looking for opinions on the best round to use for sheep out of a Ruger M77 7mm Mag. But also something that I could kill a grizzly up there too if given the opportunity.