As some of you know, I recently purchased a 338 win mag for a fall bear hunt. The rifle is a sako 75. I have fired 362 rounds of factory ammo through it 225gr and 250 gr at first the rifle shot tight groups then a round might fly off outside the normal group. I thought that it was me at first getting kicked around a little to much, so I backed off a couple of days. then back at it again, this time it got worse. Inspecting the rifle, I noticed a small swell in the barrel about 2.5 inches from the muzzle, So my question is what happened?