I have a 6.8SPC barrel from Rem factory heavy barrel on my 270WSM. You would have to open your bolt face or get a WSM bolt from PTG for yours though. Also consider that your smith won't be able to true the face of the lug surface in the action more than likely, my smith uses a cutter from the barrel end and to use it the recievers threads have to be opened up, then you would not be able to use the factory barrel threads since he would need to oversize the action threads and the factory barrel threads would be too small.
This is what I found....unless someone can correct me?
My rifle shoots great out to 1000+ even without the reciever lug surface trued.