"A. Almost all of our barrels have a bandsaw cut one inch from the muzzle end of the barrel. This indicates that the barrel is not useable beyond that point. When we hand lap our barrels, we do so from each end of the barrel. Because the lapping compound is applied to the lap directly next to the ends, the bore becomes worn slightly oversize. This oversize condition does not extend more than .50"-.75" into the barrel but we put the saw cut one inch back to ensure that you do not use any of the oversize bore.
This same condition occurs at the chamber end of the barrel too, but when the chamber is cut into the barrel, all of this oversize portion is removed with the chamber."