Need Some Help Sizing .257 STW

Discussion in 'Reloading' started by aldeerhunter, Oct 20, 2017.

  1. aldeerhunter

    aldeerhunter Active Member

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    I purchased a custom .257 STW die set from Lee which consist of the Collet Neck Sizing Die and a bullet seater. Lee made the die using fired cartridges from my gun and the bullet that I intend to shoot.

    The problem is that the collet neck sizing die (.259) will not resize the 7mm STW case neck (.287). I tried several and the result was the same each time, crushing the neck.

    I know that I will have to step the case neck down. I am not sure about the best way to do this. Some sage advice would be greatly appreciated. Please let me know your thoughts.

    Thanks
     
  2. MudRunner2005

    MudRunner2005 Well-Known Member

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    toliver and TwoMore like this.
  3. toliver

    toliver Well-Known Member

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    Not sure the press you are using it in but if it is a cam over type like a rock chucker. You need to bring the ram up screw down until contact. Then lower the ram and add two more turns. It shouldnt crush anymore. You may have to take the collet out now and spring it back out however.
     
  4. TwoMore

    TwoMore Well-Known Member

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    I use a non bushing sizer to neck down. my bushing dies just wad the necks up
     
  5. cape cove

    cape cove Well-Known Member

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    My experience using the collet dies is that they won't resize cases from one caliber to another. I think you will need a sizer die of the caliber you shoot to get it from .287 to .259 then the collet die will work.
     
    aldeerhunter likes this.
  6. just country

    just country Well-Known Member

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    morning, I have a 257STW. I bought the 7mmSTW brass. I purchased
    a Hornandy 6.5 and 25cal. neck sizing dies. no problem, trim to
    length. b carful not to crush the neck. use case lub for neck sizing.
    TUM
     
  7. aldeerhunter

    aldeerhunter Active Member

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    I am using a forster press. I just bought a full length .257 die sizer die. Hope this gets it done.

    Thanks for the replies.
     
  8. aldeerhunter

    aldeerhunter Active Member

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    Which Hornady 6.5 die are you using?
     
  9. just country

    just country Well-Known Member

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    the neck sizing only die
     
  10. AZShooter

    AZShooter Well-Known Member

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    Adeerhunter:

    If you bought a two die set with the FL sizer die, you can use the seater die first then go to the FL die.
     
  11. aldeerhunter

    aldeerhunter Active Member

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    Bought collet neck size die and seater. Do d not think I needed the full lengjth size die. I just bought a RXBS .257 STW full lenghth die set and also ordered a 6.5 Hornady die. I will see what works best.
     
  12. aldeerhunter

    aldeerhunter Active Member

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    I received the .257 RCBS die set which contained a full size die and a bullet seater. I also received the 6.5 Hornady die.

    I tried the Hornady die trying to size the 8mm Remington brass down and again it seems as though the neck is collapsing rather than sizing.

    I decided to try the RCBS full size die using a piece of the Norma 7mm STW brass I purchased. The neck sized down but left a bulge in the neck at the shoulder where the excess brass has been pushed down.

    I tried to upload a photo but have not been able to. As I type this message it dawned on me that I may now be able to finish the sizing with the colllet die or 6.5 die and remove the ring. If not,I guess I will have to trim the necks.

    IMG_1503.JPG


    Am I on the right track?
     
    Last edited: Oct 26, 2017
  13. TwoMore

    TwoMore Well-Known Member

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    looks like in the pic that you didnt make it down to the shoulder yet
     
  14. aldeerhunter

    aldeerhunter Active Member

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    Thanks. I was afraid the case would collapse. I went ahead and resized a little at a time pushing the excess to the shoulder:
    IMG_1506.JPG

    The round will actually chamber. Just wondering if I will have to trim the excess.