Trying wrapping several layers of tape around the barrel to protect it. Then lay the barrel action in the stock without tighting the bolts down. You can now use a piece of sand paper to remove the wood. Of course have the grit side of the sandpaper facing the wood. The barrel will act as a guide while you use a work the paper back and forth to remove the excess wood. Go slow and make sure you don't remove more than your idea of beauty can handle. Clear as mud now?