I've never had a problem like you describe with a Savage and I have a 10T-SR in 6.5mm Creedmoor and 5 models.
The fact that you could rap the side of the stock and clear the problem would make me think that there may be some detritus in the action that managed to jam the trigger mechanism.
I see you pulled the stock off and reassembled it. You might not have noticed anything loose in there.
You might do it again to see if anything is floating around in the action that doesn't belong in there?
Just another thought. I have one Savage .308 that, after a lot of use, locked up the Accu-trigger if I closed the bolt aggressively.
Turns out the Accu-trigger, that I had set at 2 lbs., had loosened up and was at the lower limit of adjustment. Any movement or slight pressure to the side on the trigger tab would lock up the action.
It didn't keep the bolt release from working, in fact, I pulled out the bolt when I removed the stock and adjusted the Accu-trigger back to 2 lbs. - this time with some Loctite on the nut.
It hasn't loosened again after more than 3,000 rounds.
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