Whats the largest grain for a 556


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Old 01-25-2011, 12:12 PM   #1
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Default Whats the largest grain for a 556

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 ?



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Old 01-25-2011, 12:25 PM   #2
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70gr is the heaviest you can shoot with a 9 twist barrel.

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Old 01-25-2011, 06:00 PM   #3
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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.

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