I recently built a sporterized mauser with Boyds stock. The barrel, sporter profile, does not center in the stock barrel channel. Sand open the channel to center, shim the barrel at the centered position and bed the action. After the bedding dried, shim removed and tighten the action screws, the barrel is not centered again. There isn't much wood that I can sand further to compensate for the uneven gap. What can I do to fix it? Barrel is free floated now, just the annoying uneven gaps.