I am not in any way saying the barrel you have is bad just that some ammo will shoot better in it than others. The 9" twist limits the weights of bullets you can use to 69 and under, it's actually the length that matters but lets just say 69gr and under for now. First I would try a different scope to see if it makes a difference then order a couple of boxes of 69gr Black Hills and see if that makes a difference.
I have around 90 barrels left that will not shoot 55gr fmj for anything but several of them have shot 69gr SMKs into less than 1" at 100yds when handloaded with 24gr of RE15, it's just finding the right load or ammo in most cases.
5.56, 6.8, SIX5. The Nexgen of 308s
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