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Thread: Measuring Groove Diameters of Odd-Groove Bores

  1. #1
    Boolit Buddy
    Join Date
    Aug 2005
    Central Texas

    Measuring Groove Diameters of Odd-Groove Bores

    The article titled, Measuring Groove Diameters of Odd-Groove Bores, was recently published in the June edition of The Single Shot Exchange Magazine. For those that do not subscribe to the magazine the article can be accessed at the following link:

    NRA Life (Benefactor & President's Council) Member, TSRA Life Member, NSSF member, Author/Publisher of the Browning BPCR book.

  2. #2
    Boolit Bub
    Join Date
    Sep 2016
    Thanks I always wondered how to measure an barrel with an odd number of grooves.

  3. #3
    Boolit Buddy
    John in PA's Avatar
    Join Date
    Jun 2010
    Hollidaysburg, PA
    A really comprehensive overview of a poorly understood subject.

    Thanks for the great article, Wayne!
    John Wells in PA

    Peabody's and Peabody-Martini's wanted
    Also shoot a 10-PDR Parrott Rifle in competition

  4. #4
    Boolit Master
    Chill Wills's Avatar
    Join Date
    Oct 2011
    Nicely done Wayne!

    I devised a system for the three groove Springfield rifles. V block, surface plate, depth mic and a set of plug gauges. Exchange the barrel slug with the plug gauges of about the same size until slug and gauge read the same down to the plate. 100% accurate to the limit of the mic. and operator.
    One picture is worth a thousand words - I just don't have one now.

    Your comprehensive writing gives me a lot of ideas for measuring other than the three groove barrels.
    Again, Well done! I really enjoyed reading about the other methods I did not know about. Especially the three rod method.
    Chill Wills

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