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Thread: WSM/WSSM owners help please

  1. #1
    SD Regular Greener Jim's Avatar
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    WSM/WSSM owners help please

    Those who own a WSM or WSSM could you please measure the rim and groove diameter on your brass please?

    I have the max allowable dimension off the CIP database, I'm just curious as to if it varies much below that in real life.
    CIP lists rim at 13.6mm and groove at 12.19mm.

    Thanks in advance.
    Any Questions Feel Free to PM me

  2. #2
    Hi Jim,

    Happy to measure it tomorrow for you, if no one me beats me to it (too late now) if it helps I could drop you a couple of cases in the post - sold the rifle..

    Steve

  3. #3
    SD Regular Greener Jim's Avatar
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    Fantastic Steve. I'll Pm you tomorrow about the case (i'd only need one for reference), I'd obviously cover postage for you. Thanks very much.
    Any Questions Feel Free to PM me

  4. #4
    Quote Originally Posted by Greener Jim View Post
    Fantastic Steve. I'll Pm you tomorrow about the case (i'd only need one for reference), I'd obviously cover postage for you. Thanks very much.
    Jim,

    Just measured them and picked cases that differed the most, rim measured between 13.52 - 13.59mm and groove measured between 12.13 - 12.19mm. This is Winchester 243 WSSSM brass measured with Mitutoyo calipers.

    No postage needed Jim, just an address buddy.

  5. #5
    .270WSM Winchester brass

    13.59mm - 13.62 mm rim diameter
    12.29mm - 12.33mm groove diameter

    the range is down to lack of uniformity as you rotate the case

  6. #6
    SD Regular Greener Jim's Avatar
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    Thanks for the measurements everyone. Gives me a little idea of what real brass measures in at. Hopefully we'll get more people chiming in.

    You know what Steve, I don't think I'll need that case. Thank you very much for the offer.
    Any Questions Feel Free to PM me

  7. #7
    Quote Originally Posted by Greener Jim View Post
    Thanks for the measurements everyone. Gives me a little idea of what real brass measures in at. Hopefully we'll get more people chiming in.

    You know what Steve, I don't think I'll need that case. Thank you very much for the offer.
    Any time Jim, just ask if you change your mind.

  8. #8
    Norma 270 WSM

    Rim 13.56-13.57mm
    Groove 12.09mm

  9. #9
    Hi....

    Winchester 300WSM brass.....
    Rim 13.513 - 13.538mm
    Groove 12.065 - 12.116mm

    Regards, Rob.

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