I would go with the 1 in 9 twist, Most people shoot the 68/69 gr bullets in them and do wonderful out to 600 yards. I have found that a 1 in 9 twist will stabilize some 77 gr bullets, and shot well with them. IMO the 223 rem just don't have enough gusto to effectively use the 1 in 7 twist. (I am sure there are others that are willing to argue this point.)
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