rifling twist

Discussion in 'Rifles, Bullets, Barrels & Ballistics' started by rogerstep, Nov 12, 2012.

  1. rogerstep

    rogerstep Member

    Messages:
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    Apr 1, 2011
    I have a 338 RUM, the barrel is 26inches. I would like to shoot 300grn. CE
    bullets. They require a twist of 8.5 to 1 to stabilize them. My question is
    what effect does this on other bullets that do not require that fast of
    a twist to stabilize them.er
    Thanks
    Rog
     
  2. J E Custom

    J E Custom Well-Known Member

    Messages:
    7,309
    Joined:
    Jul 29, 2004
    Typically a to fast twist rate will/may cause jacket separation at higher velocities and engrave
    poorly on lighter bullets.

    When building a rifle for one bullet you run the risk of being stuck if the rifle doesen't like that
    bullet. I have seen a lot of this when going to very fast twist rates.

    If you go with a 1:10 twist it will shoot all bullets well and you are not confined to only one
    projectile.

    It is harder to start Big heavy bullets rotating on firing and one answer is gain twist. I have
    never seen an advantage in gain twist and found the all round recomended twist to be the best.

    Most bench rest shooters normally shoot a slower twist than we do foe better engraving
    and minimal bullet damage.

    There are a lot of 338/378s that shoot the 300 grain bullets extremely well and they have 1:10
    twist. so it is not required only recomended by the bullet maker.

    My 338 RUM shoots everything well from 180s to 300s and it has a 1:10 twist.

    Do what you want and hopefully it will shoot the 300s with the 1:85 twist. A 1:95 might be a
    good twist compramize if you want to shoot 250 to 300 grain bullets.

    Just my opinion

    J E CUSTOM
     

  3. rogerstep

    rogerstep Member

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    Apr 1, 2011
    Thanks to every one for taking the time to give their input!
    It is much appreciated
    Roger
     
  4. Bughole

    Bughole Well-Known Member

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    Jan 8, 2012
    1-10 no doubt.