If the screws are tight and the rifle is bedded then there should be no movement. Correct?
Unless it is being caused by hydraulic pressure. Fluid getting between the recoil lug or other hard points and then not compressing normally as it would if it was dry. That should not be much of a factor if any at all if the parts are mated properly.
The wood stock swelling could be an issue.
If your in a steady rain where the rifle is wet all day would rain not cause this same issue.
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