Jack Cronkite, the Hosford gauge will not measure 30" barrels from the muzzle. It will measure about 16" and consequently will measure 32" barrels at all points if you switch directions. The video is very informative and the tool is a wonderful piece of design. I wish Jon Hosford much luck in the sale of his instrument. I may bite the bullet some day since the ability to measure a 28 gauge barrel may pay for itself in one bad barrel discovered. Everyone should watch the video at least once.
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