gotchanow
Active member
crowns, even the ones from the factory are far better than you could ever accomplish with a screw and a drill. It is nearly impossible to get a crown true to even a couple of thousanths with a screw. A gunsmith will indicate the bore of the rifle to .0005 or better before he cuts the crown. From what I see in the pictures that damage is on the exterior of the barrel and not the crown if you dont like the look of it polish it out with a file and like Catshooter said leave the crown alone.