We cut ours .020 over, example: 308 caliber would equal a muzzle break bore of .328, it's in your gunsmiths hands to insure it's installed correctly which is usually a piece of cake for most smiths.
If the bullet hit any part of the break, I am sure you would know it the first shot.
Dennis
PS: What are you using your rifles for? Hunting . . . Match shooting?
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