I own a Ruger Mark II .338 Win mag(pre Hawkeye edition). The barrel was always making a little contact with the fron of the stock. So i decided to sand it away(composite stock). know the gun makes a rattle noise from uop front and the gun does not seem to shoot the same as it did before. I cannot get the same groups I was getting. Tell me what may have happened?? What do you think about me getting a new stock from ruger and starting over.