Just for fun I measured the barrels on my gun. The left barrel is .733 at the breech just in front of the chamber, .728 at 4 inches from the muzzle and .715 at the muzzle. I may still be measuring part of the choke at 4 inches but over all it's .018 of choke; pretty close to what it's suppose to be. The right barrel is .725 at the breech end, .725 at 4 inches from the muzzle and .730 at the muzzle. That's .015 bigger than it's suppose to be, but after all it was built "for the trade".