Thats a tough spot to be in.Have you talked to the guy about this new problem? Is it possible he really didnt know what he had and misrepresented it to you? Is it even possible the smith has inadvertantly switched barrells with another build or something in the shop?
May be one of those deals where you chalk it up to experience? Good luck and hate to hear about the problem here.Please keep us informed as I am sure you will.Theres another side to this as well that may shed light on it?