11-Degree Crown
A common target crown angle that leaves a fine, even edge at the muzzle so propellant gas releases the bullet symmetrically.
The 11-degree crown is a shallow conical crown cut into the muzzle at eleven degrees from the bore axis. That angle pulls the critical edge of the bore back from the very tip of the barrel, where it is protected from dings, while still leaving a clean, uniform rim where the rifling ends. It is one of the most widely used target crowns precisely because it balances accuracy with durability.
The whole point of any crown is to let expanding gas escape evenly all the way around the bullet’s base as it exits. If one spot on the edge is burred or uneven, gas escapes there first and tips the bullet, opening up groups. The 11-degree cut, like a recessed crown, gives that final edge a consistent, square release that keeps the bullet pointed straight.