Here's how to get an accurate bore diameter measurement?

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Buck Conner

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Oct 20, 2015
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Our old friend Lewis gave me this one.

So how do you get an accurate bore diameter measurement?

I’ve tried with a caliper micrometer but can’t get a real confident measurement. I’d like to be able to put a lead bullet down the barrel and then measure that slug but it’s a sidelock.

bore size.jpg
Here's what I did with my 50 cal. used the shank end of a 1/2” drill bit, then added wraps of scotch tape to obtain friction fit, then measure.

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