The last part of the gun
that the bullet sees is the end of the barrel, called the crown. The crown
should have no nicks or dents or holes or any damage and it should be
perpendicular to the bore. You should examine the crown with a magnifying
Crowning the barrel should only
be done when it is needed, when there’s an obvious defect.
Crowning a little won't make the
gun shoot a little better; it's a case of good or bad, a damaged muzzle or
I crown a barrel only when the
damage is obvious.
Try to avoid crowning your
If the barrel must be crowned,
get a competent gunsmith to do it.
If you must do it yourself;
here's how to do it.
GO EASY, A
LITTLE AT A TIME! Get some fine valve grinding paste from the auto parts
store and a round head slotted brass screw from the hardware store. A quarter
inch round head brass screw has a head diameter of .450” and is suitable for
calibers up to about 35. Above that caliber use a 3/8” screw. Chuck the threaded
end of the screw in an egg-beater hand drill or an electric hand drill, put some
valve grinding paste on the round head of the screw, and go to work on the
muzzle. Move the handle of the drill around in a circular motion while grinding.
Clean frequently, and inspect the muzzle with a magnifying glass under a good
light. Stop when the end of the rifling is clean and free from damage.