ar rifle barrel twist?

1093 Views 4 Replies 3 Participants Last post by jbpmidas, Jan 11, 2011

RDRJR

Discussion Starter · Jan 11, 2011

What are the advantages/ disadvantages of the 1:7 1:8 and 1:9 rate of twist in 223 ar's. How about bullet weight to rate of twist?

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miker84

· #4 · Jan 11, 2011

jbpmidas said:
The faster twist, in general, stabilizes longer bullets better. Usually longer means heavier. I got my AR barrel in 1:7 to ensure it would shoot heavier bullets. Mine does very well with 69 grain Nosler CCHP's. It will shoot 10 well under 2" at 200 yards. 1:9 is generally in the middle and should shoot 69's and 55's pretty well.

That pretty much sums it up. The length/style of the bullet comes into play along with the weight.

This chart was sent to me a while back, maybe it well help.
.223/ 5.56mm
1:16 up to 55 grains
1:15 up to 55 grains
1:14 up to 55 grains
1:12 35 – 63 grains
1:9 45 – 69 grains
1:8 55 - 75 grains
1:7 62 - 90 grains

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