Jack,
You can remove the burr in the crown yourself with a round head brass machine bolt and fine valve lapping compound. Choose a brass bolt with a head slightly larger in diameter than the bore, and although I prefer using one of the old hand cranked drills an electric drill on slow speed can be used if care is taken. Don't apply too much pressure, and rotate the drill in a 4/5" arc around the muzzle so as to not wear a groove in one place on the brass bolt. Works like a charm.
|