I own a 300 Weatherby, never hunted Brown Bear with it, flattens elk pretty good. The 375 H&H 300 grain Nosler has 3797 ft./lbs. at 100 yards, the 270 grain bullet has 3505 ft./lbs. at 100 yards and a 300 Weatherby 200 grain Nosler has 3631 ft./lbs. at the same distance.