Not sure a 9 twist will stabilize it, but if it will, look at the 75gr Amax. I did some 223 research not long ago, looking into building a trainer. The 75gr Amax was the bees knees. Cost effective, great BC, and shoots great at distance. I got behind a buddy's 223 last weekend for 3 rounds. Full size IPSC torso at 1005 yds. First shot was just right. 2nd and 3rd were impacts. No idea on load data though, unfortunately.