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That 1:9 twist is best for bullet weights around 70 grains; may be too fast for 55 grain bullets. So I suggest staying away from max loads with 55's and use reduced ones.
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I've owned 5 or 6 223's with a 1/9 twist all were the most accurate(@100 yards) with the sierra 52gr match.
H322-, 4895, h335, CFE223, Benchmark, all good powders, but at 100 yards
give the Sierra 52gr match a try beyond 200 yards the sierra 69gr match
will do the trick, I've never found a 55gr to give me the accuracy I try for.