I realized someone counterbored it and they probably didn't know what they were doing. They removed the rifling about 1.5" from the muzzle but no real edge for where the rifling begins. I'm no gunsmith but I'm thinking there should be a very pronounced edge to where the rifling should start right? Has anyone done their own counter bore? I've read posts where guys have successfully done themselves. I can't make it shoot any worse so I'll give it a shot myself. Probably 11/16th titanium bit with cutting oil then work it slowly by hand to remove burs and see. Worst case then goto the gunsmith.
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