25/7mm Mag data?

Discussion in 'Reloading' started by CastleRocker, Oct 13, 2009.

  1. CastleRocker

    CastleRocker Active Member

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    Hey there;

    I bought a rifle for my Dad, and I need some reloading data for it. It is a 25/7mm Mag. I just need a place to start....

    Thanks!
     
  2. dirtball

    dirtball Well-Known Member

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  3. CastleRocker

    CastleRocker Active Member

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    Sorry for the confusion. It is a .25-7mm mag., that's a 7mm Remington Magnum necked down to .257 caliber. It's a wildcat cartridge. It should be very accurate (with the right load), scary fast, and with the new, high BC bullets out there now, should fit my Dad's desire for a light recoiling semi-long to long range rifle for coyotes and pronghorns.

    The problem is, I don't have the time to start loading/chronographing from scratch, and was hoping someone else out there had played around with this one.

    Thanks!
     
  4. 358sta

    358sta Well-Known Member

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    Sounds very similar to Weatherby's 257 Mag. You probably don't have the Weatherby freebore in your rifle but using 257 Wthby starting loads should be a safe starting point.
     
  5. dirtball

    dirtball Well-Known Member

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    The 257 Weatherby and the 7mm Rem Mag both have a case capacity of 80 to 81 grains of h2o, so it you used 257 Weatherby data and reduced by 10% to start, you should be safe.
    Dave
     
  6. CastleRocker

    CastleRocker Active Member

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    Thank you very much!!! I don't know why I didn't think of that...I used to have a 257 Wby! I guess I deserve a "DUH" for this question.

    Thanks again!
     
  7. OKIE2

    OKIE2 Well-Known Member

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    the 257 wby, 7 mag and 264 is all the same case just Roy rounded the shoulder & neck points on his.