That could be your culprit. unfortunately some of the staff at BPS aren't all that qualified. Thats where I would start after the action screws. I remounted a base that had came from BPS and had 15 rounds through it. Two of the three base screws where too loose by my standards. One had almost backed out. none of them had locktite on them. I called and asked BPS why they hadn't put blue locktite on the screws and they told me that Leupold had told them not to. I lockite every one that I put on.