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.
ar rifle barrel twist?
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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I'd go along with that chart, as mine does not shoot 55's well at all. That is something to take into consideration when building a new one. If you don't reload and want to shoot the "cheap" stuff, you need to go with 1:9 or slower.
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