My 6.5 CM AR has a 24" Kreiger match barrel and shoots really good with several loads. I started out with Lapua Brass (SP), Varget 38.4gr behind the Sierra 130gr TMK, ~2850fps . Also got good results with RL17 and the 130gr TMK using Starline Brass or Lapua, ~2925fps. At the time I did these I did not have any H4350 powder. Shooting less than 1 moa at 300 yrds if I do my part. I worked up a load with Starline Brass, H4350 and 140gr ELD-M bullets. 42.3 gr of H4350 shot better than the 41.1gr. These have given me 1" groups at 300 yrds if I do my part. Need to work up to these since they are over Max on some manuals.