The L.C. Smith Collectors Association
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    Re: Measuring choke and chamber length Archived Message

    Posted by revdocdrew on August 3, 2007, 1:50 pm, in reply to "Measuring choke and chamber length"

    Here are the conversions for the micrometer markings:
    70 = .700
    60 = .690
    50 = .680
    40 = .670
    30 = .660 (standard 16g .662-.665)
    20 = .650
    10 = .640
    0 = .630
    90 = .620
    The tool is easy to use, just be sure the bore is clean and re-zero with the provided .700 ring every time you take a measurement.

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