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Thread: Gibbs and Mashburn cartridges.

  1. #1
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    Default Gibbs and Mashburn cartridges.

    Hi guys.

    I wondered if anyone on this forum is using the Gibbs cartridges. I'm interested in both cases and reloading data for an article I am writing.

    I'm also interested in the Mashburn cartridges and info on them.

    Thanks
    Allan

  2. #2

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    I've never owned them, but many years ago I reloaded for a friend's 6.5 and 30 Gibbs. I'm kind of surprised they haven't experienced some kind of rebound in recent years. I never felt the powders available in those days did justice to the extra case capacity. It was the old surplus 4831 all the way, with 4350 a distant second. The wide variety of slower powders available today would be nothing but good news, I think. I think that in particular would be fruitful ground for your research, but I'm not curious enough to have rifles made for them now. I checked, and I don't have the loading data any more. It went with the friend when he moved over 30 years ago.

  3. #3
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    We have a Gibbs Mauser rifle here marked .256 Gibbs Magnum. Bore IIRC is .266 and it may have been rechambered for .264 Win Mag

  4. #4
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    Hi

    The .256 Gibbs Magnum is an English designed case. Here are the specs:

    Bullet dia; .266"
    Case dia. -neck; .300"
    Case dia - head; .472"
    Case dia-rim; .475"
    Case length; 2.154"
    Bullet weight; 145 grains
    Muzzle velocity; 2600 fps
    Introduced by George Gibbs in 1913 and based on the 6.5mm x 55mm Swedish round.

    These days it is a very rare chambering.

  5. #5
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    Still looking for cases, especially these: .240, .25, .270 Gibbs and 7mm and .350 Mashburn. Other wildcat cases are of interest too.

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