Barrel Twist vs. Bullet Weight

Discussion in 'Rifles, Bullets, Barrels & Ballistics' started by Quick Karl, Jan 13, 2007.

  1. Quick Karl

    Quick Karl Well-Known Member

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    Jan 8, 2007
    <font color="blue">I have a 300 WM with a Douglas Premium XX Air-Gauged barrel with a 1/10 twist – intending to shoot 200g bullets. A close friend suggests that 180g bullets are the ‘optimum’ 30-caliber bullet (a subjective opinion to say the least).

    My question is, will the faster 1/10 twist of my barrel degrade the accuracy of a 180g bullet by spinning it ‘too fast’. If so, what is the logic behind that?

    Looking forward to some interesting answers.</font>
     
  2. J E Custom

    J E Custom Well-Known Member

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    Jul 29, 2004
    No

    You would have to reach 3400 to 3500 fps before over
    rotation would occur.

    A 1 in 10 twist is very good in a 300win mag and will
    shoot the 220gr bullets well also.

    I have only had this problem once ,And it was a 32" 1in9 twist barreled 7STW with 120gr bullets exceeding 3800fps
    accuracy started going away at around 3700fps.

    You should be fine with 150 to 240 gr bullets, and your
    rifle will tell you which one it likes best.

    As the ausies say NO WORRIES MATE
    J E CUSTOM
     

  3. screech

    screech Well-Known Member

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    The 180 gr. ballistic tip is good along with the 200gr. accubond and the 210 berger. The 180gr bullet is not the only way to go but will work fine
     
  4. davewilson

    davewilson Well-Known Member

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    Karl, i would be willing to bet that your best accuracy will happen with the 200-220 gr bullets.

    JD, the accuracy starting to deteriorate after 3700 was probably more a problem with the bullet not being able to take the RPM's from a structural standpoint and not an over rotating stabilization issue.