7mm stw brass trim length

Discussion in '7mm STW' started by doublebull82, Apr 23, 2015.


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  1. doublebull82

    doublebull82 Member

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    Jan 28, 2015
    What length are you guys trimming your brass to my book says 2.840 but I have some once shot nosler brass that measures 2.830 just wondering if I should keep them at Since I have winchester brass that's 2.840
     
  2. Jokostel

    Jokostel Well-Known Member

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    Dec 1, 2011
    Most factory brass is going to be a breath short.
    As it fire forms... it may get a breath shorter due to brass flowing to the specs of the chamber... however, the growth is almost always done thanks to the sizing process..
    be it small base dies , FL dies.... or neck sizing only.
    Long story short... it's a few thousandths diff... but if you want to maintain the best consistency with loads trim your brass to X length AFTER they are fire formed.
     
  3. doublebull82

    doublebull82 Member

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    Jan 28, 2015
    So I should be ok to trim them what they were at factory which was 2.830?
     
  4. Jokostel

    Jokostel Well-Known Member

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    Dec 1, 2011
    Let her rock... just maintain your brass... trim every so many shots, youll be fine.
     
  5. Edd

    Edd Well-Known Member

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    Jan 26, 2011
    The SAAMI spec for brass length is 2.830" - 2.850". Unless you measure your chamber and trim based on the actual measurement of your chamber, you need to stay within the SAAMI specs.