Whats the largest grain for a 556

Discussion in 'AR-15 Discussion' started by ANAKINANAYA, Jan 25, 2011.

  1. ANAKINANAYA

    ANAKINANAYA New Member

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    I have a dmps ar-15 that has a 1-9 twist i wanna know if i can i use a large grain bullet and how safe is it ?
     
  2. cpttango30

    cpttango30 New Member

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    70gr is the heaviest you can shoot with a 9 twist barrel.
     

  3. willfully armed

    willfully armed New Member

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    Tango, (shaking head) you can do better than that.

    You can shoot whatever grain you'd like from that gun, SAFELY.

    However the weight and profile of the bullet dictate what rate of twist will stabilize it best.

    1:9 is optimal for 55gr. THe effect of twist on non optimal weights, would not be noticed in ranges of 100 yards or less.