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Would not offer this info up when presenting said rifle back to the gunsmith, might be used as a 'get out of jail' card against you...

Ah righ, that sounds bad :o

Keep us updated on the fix.

A wee video showing the problem may help diagnosis.

Small base die should fix that?

Nope, the bolt lift being normal as per OP's first post would not indicate a PE problem.
alphaDelta could you stick up a video showing extraction after firing if possible? Focus being on where the...

Had the exact same problem on a Remington Model 7 that some fuckwit 'gunsmith' put a PTG Rem 700 bolt into and never bothered to check headspace.

I'd put £20 on it being long-chambered, the brass...