Cadex makes a very good point. I had a similar experience, it took a long time to home in on the action screws and ultimately Grant Taylor sorted the action screws and the bedding out. Not withstanding this comment, you need to go through a structured process of elimination to work out what is really the issue for you. Good luck. JCSI had something similar some time ago...........it turned out to be nothing to do with the moderator...........it was the screws that held the action in the stock that wernt tight.