I have been "lurking" for a good while, now I have a question for you guys. I recently purchased a used Savage .338 WinMag 110-E with a Leupold 3-9X. Problem with it is at 100 yds it will not group at all. Shots are scattered across the paper in absolutely random order. I am using factory Federal Premium 250gr soft point. Found no cracks in the stock, barrel not touching any part of the stock, some copper fouling noted but not bad, scope is tight. Are .338's that picky with bullet weight? What else do I need to check before I pull the scope?