Grit in the lug recess, that's what I was wondering also. If you have a shotgun cleaning kit or a slotted jag slide a large cotton patch in it and attach it to a cleaning rod soaked with cleaner and spin it around in the recess just before the chamber, that should tell you if that may be the issue. Re lube after.
Is this a stainless action?I have seen lugs in SS actions galled badly from running with no lube for years and not being cleaned properly.
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