We follow the methods laid out by Greg Tannel and they go as follows. Using precision ground bushings that properly fit the front and rear of the action a precision ground mandrel is slid into them. This allows the action to be dial indicated into the centerline of the bolt bore raceway. The action is placed into the Action Truing Jig and then the jig is placed into a four jaw chuck on the lathe. Using two 0.0001 dial indicators placed to read off of the mandrel, the jacking bolts on the truing jig are move to center and hold the action to have no more then 0.0001 runout. The mandrel and front bushing are then removed and the truing cuts are made. The face, threads, and lug abutments are single point cut to be perfectly perpendicular and true to the action bolt bore raceway. Care is taken to only remove what is necessary to clean up the surfaces. The threads are typically enlarged to 1.075. After this the bolt is placed in a jig of similar fashion to the action truing jig and dial indicated to run true to the outside of the bolt body. The rear of the lugs, face of the lug, bolt nose, and bolt face are then single point cut to be perpendicular to the outside of bolt body. The bolt is then lightly lapped to the action. This is all done so there is a perfect relationship between your bolt, action, and barrel. With a properly chambered and threaded barrel you now have the centerline of the action, bolt, chamber, and barrel working together to give you the consistency and accuracy your after.
Again the methods used for bolt sleeving follow Greg Tannels instruction. The bolt is held in the rear using a jig that screws into the bolt shroud threads and in the front with a jig that slips into the firing pin hole and a live center holding the jig. The rear of the bolt body is dial indicated in to run true and the area or areas that will receive a bushing are cut to accept the two piece bushing. The bushing is then fit to each area and epoxied in place and allowed to dry. The outside diameter is then turned to have 0.0005-0.001 total clearance to the bolt bore raceway of the action. If this is being done with action blueprinting the cuts mentioned above are then made to bolt without removing it so all cuts will be true to the newly installed bushings. The bushing is then filed down on the uncocked top and bottom to make it elliptical similar to borden bumps. This allows smooth cycling and reduces the risk of the bolt locking up from debri but still allows the bolt to have no movement when in the cocked position. This is done to keep the bolt perfectly centered to the bolt bore raceway while in the cocked position. This provide more consistency throughout the firing process and your firing pin is now centered. This is recommended for competition rifles. On hunting rifles we do not recommend it due to the possibility of the bolt locking up from dirt and debri. This is also done in conjunction with reaming of the bolt bore raceway.
Any other information or questions you would like answered send an email or give us a call.