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The only bore gauge that I know anything about is the Bulley. The one I have only measures 12 and 16. He makes another one for 20 and 28. Mine seems well made a gives repeatable measurements. Bore and choke constriction measurements are easily obtained. I have not measured pit depth but it should do well on ones that are not tiny. He has a you tube demo but I do not have the link. Bob
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