Tom, I will get you the number of a good gunsmith up your way, but I don't know if he will work on a factory barrel.
Here is the issue, the factory chamber is huge, and normally gunsmiths have reamers that are more toward match dimensions.
So, a gunsmith has to cut off enough of the barrel to where the chamber starts to taper and get smaller in dimension. Often, there is not enough barrel shank to do what I have described. For this reason, a gunsmith can not re chamber some factory barrels, depends on the barrel and the amount of straight shank he has to work with.
I would urge you to consider an X Caliber Barrel made in Montana, the 4 that I have are simply unbelievable in how they do not copper foul and the accuracy is like benchrest standards. A contoured X caliber barrel is $200 that is not chambered and they can deliver the barrel to you in about a month. X caliber has the newest and latest hole drilling, hole honing, and button rifle equipment that is being made today. Getting a hole drilled straight and honed after the drilling is of major importance along with heat treat with the bore sealed during that process.
There are some good gunsmiths on this board, do a search on Sponsors, I don't think twice about mailing my gun to a gunsmith...never had any problems. Besides, all you need to mail is the barreled action.
Good luck