6.5 Twist

Discussion in 'Rifles, Bullets, Barrels & Ballistics' started by Terry Brady, Nov 1, 2003.

  1. Terry Brady

    Terry Brady Member

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    Oct 27, 2003
    What would be the best twist for a bullet weighing from 140 sierra,s to maybe 147 C. River grain bullet?
     
  2. chris matthews

    chris matthews Well-Known Member

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    May 14, 2001
    Need 1-8 twist.
     

  3. Steve Shelp

    Steve Shelp Well-Known Member

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    May 3, 2001
    Terry,
    I've fired Sierra 142s MK, Sierra 140s MK, Lapua 139s, and Hornady 140gr A-Maxs through 2 seperate 9" twist barrels without a problem. And the one barrel did a whole bunch of winning at 1K BR matches. Haven't fired them in extreme cold weather though. About 30-40F is the lowest temp I've fired them in.
    The 140gr Sierra in a 9" twist is good as low of temperature as you can stand. I've fired them with snow on the ground and the temp was %%^$%^ cold without a problem.
    The Clinch River 147s work great in 8" and 8.5" twists by actual firing and hopefully will get to try them in my good 9 twist barrel this weekend. But it's going to be close according to calculations. We'll see.

    Steve
     
  4. mbianchini

    mbianchini Well-Known Member

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    Dec 3, 2002
    my 6.5 WSM's got 9" twist and the 6.5x284's got 8" twist.
    What velocity are u going to drive the C-Rivers?

    [ 11-05-2003: Message edited by: mbianchini ]
     
  5. Lee in OH

    Lee in OH Well-Known Member

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    Jan 22, 2003
    I've got a three groove Pac-Nor barrel chambered for 264 Win. Mag. with an 8" twist. Shoots the 140 SMK's great at just over 3000 fps. Not the most efficient cartridge in the world, but the dies were only $40. How many rounds of 6.5-284 would I have to fire in order to save $200 in powder to cover the extra expense of the dies????

    That's my story and I'm stickin to it!!!!!!

    [​IMG]
     
  6. ottsixx

    ottsixx Active Member

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    Feb 10, 2009
    8:1 twist rate
     
  7. trueblue

    trueblue Well-Known Member

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    Terry,
    You have gotten good advise. Go with a 1:8 twist.
     
  8. zigliss

    zigliss Well-Known Member

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    Nov 12, 2008
    Another vote for 1:8. I have just had a custom 260 rem completed with a 1:8 twist specifically to handle the heavier bullets.