JFD...There just isn't many real gunsmiths left in Florida. The A.W.Peterson Gun Shop in Mt. Dora is fair but I would not take the job on the Smith there. I think you would be better off letting Smith & Wesson rebarrl the revolver. Opening up the chambers is no real deal..there are various poat and Tech Notes here on that. Also Marshall has an excellent tech manual you shouls get. It covers everything you can think of about cast bullets. Maybe some of the rest of the forum moght suggest a specialty gunsmith, but get ready to put bucks out with them.
Best Regards, James