loosen the fore end screw and slip a spacer like a piece of macth book cover. Tighten the screw good and tight and try it again. Remington relies on a pressure point near the end of the forearm. Sort of the oppisite of free floating. I have seen this cure a lot of Remington problems. If it works just coat the cardboard with a sealer and leave it in there. Or glass bed it. I had a 788 Remington 308 that just would not shoot. An old gunsmith told me to try that and it instantly started shootin one inch groups.