My 2 cents worth, spring loaded bore gages, expand take out and measure with a micrometer work shallow & take some pratice to use properly. Have a set never use them, can’t get repeat consistent Measurements. Chinese and cheap, Starrett set may work better.
Inside micrometer is easy to use and accurate. But is also shallow, 1/10 inch or so from the muzzle. Think I paid 60-70 bucks for my Mitutoyo inside mike used. New double that price. Use it a lot general shop work, not on shotgun barrels. Have a Mitutoyo tubing wall thickness mike too, useful but again 1/10 or so deep.
Deeper accurate enough not real expensive the Skeets Gage its the one I use on barrels. Wall thickness I get somebody else to measure for me. Would buy one if I saw a deal.
Never owned one of the inexpensive dial deep calipers. Opinion without experience would not bet a Chinese 5 inch deep dial is as accurate as a Skeets & for sure won’t go deep enough.
William
Last edited by William Davis; 07-28-2020 at 07:02 PM..
Reason: Spell
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