Seems your Mountain Rifle '06 barrel would end up "awfully thin" if you have it bored out to .338? I bet the Bergara has more meat in the barrel. You "could" have the Bergara bored out to the .338 Federal and have the best of both. 358"esq" performance in the woods and with the Barnes 160-185 able to go "out West" and hunt anything you would with the 338/06....just another option for you. Leave the '06 alone. smile