I have a custom 260 built on a Stevens 200 action in an AI chassis system. The only problem that I have is that if I rest the rifle on the magazine or exert any upward force on the magazine, such as in shooting from field positions, the bolt jams on the magazine feed lips. I tried some spacers between the action and chassis to see if I could bed the action and gain the needed clearance but then there isnt enough threads left.

Anybody have any experience with this? Any ideas on how to correct this condition?