The barrel is Shilen, called them looking for a cheap way out hopped to rechamber the gun. They pulled the prints on the MK1 and said no go . Looking for a chuck gun that would reach out there. Its an older ruger No.1 rolling block. Redding sent a fl die set over to the shop, could not find them anywhere else. I would like to give it a try thats why i inquired here so i dont blow myself up.