I have a DPMS AP4 carbine, the most accurate load I have found so far is a Hornady 60 gr. V-Max over a moderate charge of H335. It will shoot 3/4" @ 100 yds. all day. I load with Benchmark in my 223 boltgun, but could not get it to shoot as accurate out of my AR. (I only tried 40 gr. Bal Tips, they shoot great out of my boltgun) My AR has a 1 in 9 twist and seems to like the 55 to 68 gr. bullets the best.