I know Fred will slap me for this but does dry fire sound week or does it have the snappy sound of a hard hit? Im currious if there was a bad batch of springs. Is there a way to test the spring tension with a postal or household scale? I'm thinking 20 lbs(pulled that out of my %#$) would be minimal.

Also make sure the trigger(or anything else) is not interfering with the sear travel.

If you take the barreled action out of the stock and fire some primed cases with the offending brass and primers , do the primers ignite?