300 Win Mag to 375 ? ? ?

Discussion in 'Technical Questions & Information' started by SD Hunter, Oct 8, 2005.

  1. muddober

    muddober Active Member

    Joined:
    Sep 19, 2008
    Messages:
    1,447
    If it were me and I was going to look into building a short 375 caliber cartridge I would NOT use any belted case, rather I would use the rimless non belted 404 Jeffrys case or a 300 ultra mag case. You will have to open your rails up just a bit in your action but then you would really have something. That belt was put on there to allow ejection in single shot and double rifles and for far too many years falsy created a "magnum" image. The 404 Jeffery case, as is the 300 ultra mag are about the same outside diameter of the belt thereby providing far more powder capacity which will actually make a shorter cartridge that will out perform the standard 375 H&H. The 375 H&H in my view has always suffered a shortage of powder volume, an issue that would be eliminated by using either of these two larger cases.

    Ron
    Last edited: Mar 19, 2012

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