Hey Thaninator - How about the .300 Rem Ultra Mag on Brown Bears??? They have 20% more energy than the .300 win mag and 17% more than the .300 Wby mag. Or do you feel the .338 is still the better choice. In terms of ballistic #'s the 300 UM is as good as the 338 win... However, I know the 338 has heavier bullet weights.