Let me tell you a secret, how big and tough you are has nothing to do with what gun you hunt with, pick the right gun for the game and go hunting...
Frankly, a 7mm-08 is a dandy rifle for big game and will kill just as well within say, 300 yards as a 7mm Mag...
Sure, once you get to 4-500 yard shooting a 7mm Mag helps, but 95% of the hunters out there have no business shooting at game at 500 yards...