Rocky Mountain Rifles are Corlanes Sports in Dawson Creek. Rod is the guy you want to talk to. A new barrel with threading and chambering will likely be in the $700 to $800 range. I just talked to a guy a few days ago that is getting a 7mm done at Corlanes and I'm sure he said the barrel would come to $800. David Henry Gunworks in Bentley Alta also does good work. Both have done work for me and I would go back to either one.
Saw this post and WOW...IT&D Custom Firearms in Minerva, OH, USA will do that for a lot less [U.S. Dollars] ...IF the customs people let it get over and back. He has done good work for me. He is on the web and has done work for lots of guys in Alaska,who seem happy as well.