Sometimes it is easy to overlook the simple stuff. Glad you kept wit it and got it figured out.
When I built my 6br, I re- heaspaced it about 5 times cause I would have hard bolt lift on a fired case, but no pressure signs. After a while I decide to pull everything apart, and noticed it would close on that fired case when out of the stock.
The culprit: The front action screw was just long enough to to have hard bolt lift on a fired case, but still close and open an unfired new case with no trouble at all. About 30 seconds with the dremel to grind it down a hair cured it all ::)
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