Rockdoc:
I could add to what "AmarilloMike" has experienced with Briley. But I won't. Since you are in Texas, I strongly suggest that you call Kirk Merrington. He's near Kerrville now, but formerly of Churchills in the UK. And a man you can trust for such work without hesitation. I do.
His phone: 830.367.2937
Best, Kensal
I heartily cast a third vote for Kirk. He's perhaps one of the best double gun gunsmiths in this hemisphere. Right up there with Turnbull. Be prepared to wait and to pay a premium though.
As an alternative, I had a Bonehill worked on by a guy out in Waller named Bobby Pitchford. He worked under Kirk Merrington while they were both at Briley. He spun off and opened his own shop in Waller. He's primarily a riflesmith, but he's a fantastic gunsmith and I'd recommend him staunchly to anyone.
His site...
http://www.pcgguns.com/