One sure way to verify your results is to compare the readings you get on the Stan Baker gauge with measurements taken with a good set of plug gauges. Of course, the Stan Baker, or Skeets, etc., type instruments can pass by a very slight obstruction in part of the bore, such as a minor dent. A solid plug gauge will not.
My use of both the Stan Baker gauge and plug gauges gives me confidence that the Baker gauge is reasonably accurate when properly calibrated and used correctly. It is less tedious than pushing a series of plug gauges through a bore with a wooden dowel rod. It can also detect whether a portion of the bore has been excessively polished or honed to remove pits. But the plug gauges are also useful, because they can do double duty as barrel dent removal plugs when used in conjunction with a small brass or plastic faced hammer.
