Does it do the same thing if you remove the action from the stock or loosen the action bolts? If not, I would take the trigger guard off and look to see if the rear of the trigger is contacting the stock just above the rear trigger guard screw. If so, only minor contact could be causing the problem. I had a similar problem on a re-stocked varmint rifle and it took me forever to figure out what was causing the problem the first time. A little dremel work in this area should fix it.
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