I understand the op, alot of answers here are telling him to load up for bear protection. From guys who may never have seen a grizzly in the wild or hunted where the bears walk. Keep in mind he's sheep hunting. I prefer an accurate bullet out of my rifle that's going to reliablely open on a sheep at sheep hunting distances. He doesn't need to sheep hunt with 200 gr woodleigh, 220 A-frames or get so paranoid of bears that you limit your sheep opportunity by choosing a bullet that may not open reliablely on thin skinned game. Bear encounters do happen, just not as much as many people think that it will to them. I wouldn't load up a bunch of SST's or ballistic tips for a sheep rifle in bear country. A good bonded bullet or a 150 gr mono will do just fine. I'm sure there's plenty of hunters here that have packed alot game out of grizzly country, myself included and that we know there isn't a bear behind every tree waiting to get you. A well made 180 or 165gr out of a 30-06 is going to work good on sheep and be able handle a mountain grizzly.