I’ve tried benchmark, cfe223, imr4166, and ram tac. Tac has been the best results. 24.6gr tac has been a good node for avg 2730 fps 0.63-1.05in grps at 100 yds 5 shot. Still working towards the top.26.9 gives me 2800. All with a factory colt 16in 1/9 barrel
