The gun that you bought is fine. But what caliber .300 are you shooting?? Is it the WSM or the long action Win Mag. Although they are both very similar in performance, it is important to know which cartridge you are shooting. I would recommend that you get closer to the deer and bear for the first couple of years before you start taking 400 yard shots. Either 300 has enough energy that you will not have to worry about a bear chasing you down at less than 300 yards or so.. It is better to make a good shot at a short distance than to make a bad one at a long distance, which can lead to a long tracking job, after an injured bear... NOT FUN! I would also make sure that you shoot at least 200-300 rounds a year to become confident in the rifle.