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Unread 03-01-2017, 09:34 AM   #6
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Richard Flanders
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I have one of the Enco finger gauges mentioned above. It works fine on most Parker chokes but is limited to around 3". A few years back Dave Suponski offered Starrett inside diameter vernier calipers for sale here. They can measure to a depth of a bit over 5.5" and are accurate to .0001", I think. I couldn't get one fast enough. Not sure how large a diameter they'll measure but the smallest seems to be 9/16"(.5625") so they're great for smaller bore guns of greater than .410. I'm not sure I've tried on on a 12ga or larger. Dave could likely give a better description. I do know I love this thing.

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