Pete, I'll look at my books for 65mm bottlenecked ctgs. and see if I can give you some suggestions (away from books right now). No suggestions as to gunsmiths (had a less-than-satisfactory experience with a local recommended one recently) but maybe somebody will chime in or you might ask on the regular double shotgun BBS or the double rifle forum. There are several CA shooters who post on the shotgun forum and they might know. But you may have to ship that gun out of state for best service.

I will be getting down your way more in the future; my younger son just got orders for the Special Warfare Center in Coronado. He'll be there in May, so maybe we can get together after that.

Mike Armstrong