CSP Bore Micrometer

When I have the opportunity to write a review on a shotgun, one of the areas of information I like to include is the choke constriction as it relates to the bore size of the shotgun in question. After all the years I have been involved with smoothbores, it still amazes me how many shooters do not understand or actually comprehend that choke value is only determined when the bore size is known. So many gun owners think all they need to know is the size of the muzzle exit. Somehow they do not get it that you must have the internal diameter of the bore as well as the I.D.

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