I have used the 7mm Rem. Mag., the 7X57mm, the .30/' 06, and .270 Win. for about 40 years for hunting deer, black bear, and elk! There' s not enough difference between any of these four to recommend one over the other by any discernable margin! If I were to go after BIG, DANGEROUS bears, I' d use a .338 Win.. a .340 Weatherby, or something in the .375 H&H class!!