To me, G&H should have made good on the barrel lug being loose. I would take the bill and go have that sit-down with them and give them the bill. That is why the ejectors didn't lay up against the barrels, with the lug being loose.
Also, while there, I would return the gun to them, .018 is just too thin at that area and the person at G&H should have known better and definitly should have measured the bores and listed them. He screwed up big time.

As for Orvis, if you asked for measurements they should have given them to you before any work was done, shame on them too. Same for Turnbull. It is all about money to them, screw your safety.

David