I dont know a lit about this stuff but Have you done anything new to the rifle. Like tighten the scope base. That front screw could cause some drag.also I have had the action screws cause drag on some guns. There could also be a built up of grease etc in the locking lug surface behind the chamber. I remember a pine needle somehow getting in there and causing quite a mess. Thankfully I have purchased the tools and pad to clean that area.
Good luck
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