Recrowning a rifle muzzle.

[Larryjk]

Mike Moss, If you have been using the stone to finish the crown, I think you have been lucky. Do what Adam suggests and use a round headed brass screw and lapping compound. Start with about 200 grit and finish with 400.
By the way, gunsmiths see things other folks don't when looking at guns. Look at your picture. I see jacket metal on the lands of the right hand barrel.