So what is your crown when running a muzzle brake. Is it the last baffle in the brake where the bullet exits? Or is it the actual crown on the barrel after the threads?
The "crown" would be the last place at which the projectile is directly in contact with the lands and grooves of the barrel. But if you are trying to figure out if the end of the muzzle BRAKE (not "break") is the end of the barrel for length purposes then that is an entirely different issue.