Dialing a barrel in on both sides of the bore. 

In this video we are performing a test where we dial in both sides of the barrel in instead of co-axially dialing in the bore on the muzzle side which is where we are doing our machining. You can see that even though both indicators are reading very little runout, we still have lots of runout in the bore if we bring our muzzle indicator about an inch from the muzzle. This in our opinion would not be good for barrel threading.