I have the 6.8 amd 6.5 , I use 8208 xbr and benchmark in both. I have used the 120 sst and the 115 SMK with decent accuracy, I use a PRI magazine. They are expensive but work well. I would get SSA loaded with accubonds as they seem to be the hottest I have shot, just ensure if you have a spc or SPC II chamber you buy appropriate ammo, spcII can shoot SPamo., spc II chamber is almost like a 5.56 vs 223 rem version of it. Correct me if I'm wrong forum.