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Thread: Project 10mm

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  1. #21
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    I say again:

    Quote Originally Posted by niemi24s View Post
    I think the only way to find out with any certainty is to slug the barrel to find what the groove diameter is.
    Be smart. Don't assume anything. You must find the groove diameter.

    SLUG THE DANG BARREL!!!
    When you can measure what you are speaking about, and express it in numbers, you know something about it; but when you cannot measure it, when you cannot express it in numbers, your knowledge is of a meagre and unsatisfactory kind. [Lord Kelvin]

  2. #22
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    If there are an even number of grooves, and one is careful enough, it's possible to get a reasonably accurate measurement of the bore with the inside jaws of calipers and a micrometer.

    After measuring the groove diameter with calipers, the calipers should be locked in position. After locking, it should be retested for a close fit in the bore. If necessary, the calipers should be readjusted slightly up or down and relocked until it just fits the bore grooves. The calipers are basically being used as a fixed gauge at this point.

    The jaws can then be mic'd. The orientation of the mic faces on the caliper jaws that produce the greatest reading will be the correct one. You are looking for the maximum point of span of the jaws.

    SAAMI doesn't seen to list anything other than the Corbon for .400.

    -
    Last edited by megafiddle; 11th December 2018 at 19:40.


  3. #23
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    Quote Originally Posted by megafiddle View Post
    SAAMI doesn't seen to list anything other than the Corbon for .400.
    -
    Inconclusive. The link I provided several posts above ( http://cartridge-corner.com/revolver.htm ) includes several cartridges that include ".400" in the name.

    • 400 Eimer Colt
    • 400 Revolver
    • 400 Corbon
    • 400 Webley
    • 400 Colt Magnum

    There may be others. What really matters are the measurements of the chamber and barrel.
    Hawkmoon
    On a good day, can hit the broad side of a barn ... from the inside

  4. #24
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    Quote Originally Posted by Hawkmoon View Post
    Inconclusive. The link I provided several posts above ( http://cartridge-corner.com/revolver.htm ) includes several cartridges that include ".400" in the name.

    • 400 Eimer Colt
    • 400 Revolver
    • 400 Corbon
    • 400 Webley
    • 400 Colt Magnum

    There may be others. What really matters are the measurements of the chamber and barrel.
    Yes, but how likely is it that the barrel was chambered for a rimmed cartridge?

    All but the Corbon are rimmed.

    -

  5. #25
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    Who knows?

    I'm still unclear if the barrel is marked ".400" or that's just a measurement that was taken.
    Hawkmoon
    On a good day, can hit the broad side of a barn ... from the inside

  6. #26
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    In case you're not aware of it, all the dimensions and tolerances for cartridges and barrels can be found here: https://saami.org/technical-informat...mber-drawings/ And if you are aware of it, they can still be found there.
    When you can measure what you are speaking about, and express it in numbers, you know something about it; but when you cannot measure it, when you cannot express it in numbers, your knowledge is of a meagre and unsatisfactory kind. [Lord Kelvin]

  7. #27
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    Quote Originally Posted by niemi24s View Post
    In case you're not aware of it, all the dimensions and tolerances for cartridges and barrels can be found here: https://saami.org/technical-informat...mber-drawings/ And if you are aware of it, they can still be found there.
    This only covers cartridges that have been submitted to SAAMI. As I noted in a previous post, there are several handgun cartridges that include ".400" in the name that are not in the SAAMI standards.
    Hawkmoon
    On a good day, can hit the broad side of a barn ... from the inside

  8. #28
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    I didn't see this thread until now...

    In the opening post, the barrel is referred to as a
    ultrmatch .400 barrel
    Any chance 'untrmatch' should have been 'ultimatch'? I ask because there is someone out there who sells barrels marked as such and, more crucially for this conversation, he sometimes marks them 'cal .400', to signify that said barrel isn't finish-reamed, and can be finished either as a .40S&W barrel or as a 10mm.
    http://www.schuemann.com/OnlineCatal...filter=22%2C16

    In Schuemann's jargon, 'Ultimatch' means simply that it's a bull barrel, intended to be used without a barrel bushing.

    If this is indeed a Schuemann barrel, using it in a gun with this frame puts a new spin into the whole "making a silk purse from a sow's ear" affair.
    Too many people miss the silver lining because they're expecting gold.
    M. Setter

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