257 stw case dimensions

Discussion in 'Reloading' started by Rusty Nail, May 3, 2013.

  1. Rusty Nail

    Rusty Nail Member

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    Oct 1, 2012
    Hello

    My father in law has a new 257 stw and we are working on load data for it. But wondering what the trim length of the case should be? I understand you neck down the 7mm stw case, but I,m just looking for overall case length for the 257 stw. Thxs for any help
     
  2. Cheyenne 1

    Cheyenne 1 Well-Known Member

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    Dec 9, 2007
    I have a 257 stw. And a 257 stw ackley The way both of mine are chambered I trim to the same length as the 7 mm stw case. Not sure if you have loaded any rounds yet. Mine are pretty picky about the loads. I was using r25 for a while but I would get pressure spikes. Now I have been using the ram shot magnum which is basically a ball powder. The longer stick powders bridge and cause spikes in mine.
     

  3. boomtube

    boomtube Well-Known Member

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    I don't have a manual close by so I don't know what the max case lenght is supposed to be. The 'trim to' lenght can be anything you want but all the books will suggest trimming to 10 thou less than max.
     
  4. Cheyenne 1

    Cheyenne 1 Well-Known Member

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    Max length is 2.850. And trim to 2.840
     
  5. Rusty Nail

    Rusty Nail Member

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    Oct 1, 2012
    Thxs for the replies guys. I,ve read a lot that others are having better luck with ramshot as well.