As Mule Deer has advised several times.Place a plastic clip, like found on bread bags, between the front action screw and the recoil lug. Then shoot the rifle to check if problem still exist. This lifts the action up and gives you some indication of what is causing your problem. Older times, a piece of credit card was advised, but with John's method, the hole in the clip is the rightsize and stays put .
I bet there are lot of old guns in the filed that still have the plastic piece in them. It fixed the problem and guys never went back to glass bed it properly.
