Originally Posted by
Robinhood
Your way centers the rear bolt bolt raceway and the barrel threads. Much better method. You can tell if your method works by shooting targets at 50 100 and 200 yards out. if the point of aim keeps you centered on the target your good to go. .002 off at the action face can mean as much as .040 off at the end of the barrel. Those numbers could get you 6" off at 100 yrds if your scope base is aligned with the centerline of the action. Have you ever heard about anyone being off target after they sight in at 25 or 50 yds then go to 100 or 200yds? Could be a bent barrel or it could be something wrong with the action face.
This is just my humble opinion. I don't machine actions for a living but I do run a HBM's, VTL's, Lathes, Mill's and Precision Grinders at least 250 days a year. Where tolerances are held to a minimum sometimes to .0001 on the grinders. Stacking tolerances are kept to a minimum.