dogcatcher,
I suspect the problem is a crappy installation!
Even if the receiver had been properly trued and threaded from the first barrel installation. Your smith could have taken a good aftermarket barrel and threaded it in a way that resulted with the barrel not screwed on straight to your receiver.
OR when he cut the chamber, the reamer may not have been concentric with the bore.
The only path to satisfaction I can see for you is to have another smith install another barrel.
