Bob Day, in Pico Rivera, CA.
http://www.americhoke.com/ A recommendation from Chuck H.
Bob did a very good job for me, on a hammer Bernardelli. It had chrome lined bores and I wanted the chokes opened up and the POI was a bit off on one barrel. The total work was around $300 but the results were exactly what I wanted. I sold that gun to someone on this board, maybe he'll chime in to verify that the gun shoots as intended. I wish I had kept it! I have done it myself, on other guns. You can make a scraper out of a 3 cornered file, mounted on a wooden handle. You can also make a honing tool out of a dowel, a little smaller than the bore and wrapped with emery paper. Spin it with an electric drill motor or in the chuck of a metal lathe. A .410 can be done with a 3/8" rat-tail file. Put a piece of plastic tubing on the small end, to protect the barrel.
P.S. There's an article about doing it with a scraper in one an old NRA Gunsmithing book.
