223 key holing

DAMMITDON

July 25, 2012 06:48

I have DPMS 223 shoots great with factory amo.BBL is 1 in 9 twist when I shoot sub sonic [1125] amo I get key holes @100 yd.fine at@50YD.Do i need a different twist?,are what.

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  Rocky Raab

  July 25, 2012 06:54

  Low velocity is the problem. Bullet velocity directly affects the spin rate, and therefore stability.
  
  Unless you are using a suppressor, there's no earthly reason to shoot sub-sonic ammo.

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  charliemeyer007

  July 25, 2012 07:28

  Look at the bullet weight of your ammo. More than likely on the heavy end; you might get acceptabe results with the lighter end weight bullets.

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  Mobuck

  July 25, 2012 16:22

  That's why a certain twist rate will handle heavier bullets with a bigger case(more velocity).

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