We'll when I get the .280 Mountain Rifle, I'm going to see if it prefers 160gr accubonds, 140gr accubonds, 150gr TSX's, or 168gr Bergers. If it likes one, and isn't picky about seating, etc., then that is likely the way I will go. I will keep shots in the 300-400 range or under, so I should have over 1500 ft lbs of energy and ideally under a 4" radius to count on. The gun hold's 4+1 and I won't be afraid to use them all. Leaning toward the accubonds/TSX's over the Bergers though, as if I get a chance to break shoulders, I will try for both. I was talking with an experienced guide, Mike Scott, who gave some great advice. When possible, take a slightly quartering away shot, from the last rib toward the off shoulder, which gives you both lungs and a shoulder.
PS Anyone considering guided Goats, Sheep, Deer, or Elk guided hunts in his area in the White Cloud and Boulder Mtn's of Idaho should call Mike, he seems top notch.