7mm wsm twist rate

Discussion in 'Rifles, Bullets, Barrels & Ballistics' started by grouse, Mar 3, 2018.

  1. grouse

    grouse Well-Known Member

    Messages:
    607
    Joined:
    Oct 15, 2010
    I have a 7 wsm savage with factory 1-10. Seems to be shooting pretty good but haven't gone to anything above 162. Think this twist will hold up to longer heavier bullets?
     
  2. elkaholic

    elkaholic Well-Known Member

    Messages:
    6,693
    Joined:
    Dec 4, 2008
    Not very well! You can run a 9 with some of the 180's, but most people get an 8 now with all the long, heavy bullets available.....rich
     
    MudRunner2005 and Ingwe like this.
  3. FEENIX

    FEENIX Well-Known Member

    Messages:
    10,930
    Joined:
    Dec 20, 2008
    That depends on how fast you can push it and what altitude you're at or your hunting grounds. For instance, I have .300 WSM with 1:10" twist and the Berger 215 calls for a 1:9" twist. I am pushing it at 2750 FPS out of 24" barrel"

    @ 0' altitude, SG is marginal at 1.47 (1.5 or higher is ideal).
    @ 3333' altitude (my home/range) SG is comfortable at 1.67.
    @ 7500' altitude (elk hunting grounds) SG is comfortable 1.95.

    Try http://www.bergerbullets.com/twist-rate-calculator/

    Good luck!
     
  4. grouse

    grouse Well-Known Member

    Messages:
    607
    Joined:
    Oct 15, 2010
    Thanks. If i push the velocity I could get away with 175 at 5000 and up.
     
  5. FEENIX

    FEENIX Well-Known Member

    Messages:
    10,930
    Joined:
    Dec 20, 2008
    That's the ticket ... good luck!
     
  6. heimdd

    heimdd Member

    Messages:
    22
    Joined:
    Sep 24, 2009
    I have 2 with 9 twist, I shoot the 180's
     
  7. FEENIX

    FEENIX Well-Known Member

    Messages:
    10,930
    Joined:
    Dec 20, 2008
    You should be able to as Rich noted.