Triang wrote:What makes a good barrel crown?
I guess you know this, but just in case...
Obviously there is a huge amount of gas behind a bullet as it's fired.
The gasses flow out of the crown while the bullet is still close to the muzzle, and whatever the condition of the crown is will affect the behaviour of the gas which will affect the flight of the bullet.
If there is a gouge or ding or something on the crown that makes the gasses escape in an uneven way, this will be pushed onto the bullet and affects its accuracy.
A good crown is a consistent crown.