Bump back up ,I was just looking at the barrel that Joel sent me , I was checking it out with a bore scope compaining it to a Bartlein , Hart and a Lilja I have here and I have to say I'm very impressed with the bore condition ,its noticably smoother than the others , has WAY less "tool" marks from the rifeling and lapping.
Also a note for the guys that don't know , the material that is used in these barrel is much differant than whats normaly uses.
416 SS normaly used in rifle barrels , has a yield strength of around 40 to 45 ksi and a Brinnel hardness of 230
17-4 that is used in these barrels , has a yield strength of 135-145ksi and a brinnel hardness of 330+ !!!
17-4 is much more resistant to erosion and corrosion making it perfect for barrels.
when chambering these barrel you have to take care to keep the reamer cool and use a good cutting oil , a chamber flush system is optimal but one can get a great chamber by just dabbing oil on the reamer each time he cleans it , of course it would be best of you either drill or bore the chamber out close to the reamer size first or use a roughing reamer but its not absolutly needed. If you try to run it to fast and get impatient with will be hard on the reamer.
Good cutting oil Like Moly-Dee and frequient cleaning of the reamer and chamber make it no big deal.