I have built an AR15 with a 24" Olympic Arms SSMatch barrel with a 1:10 twist. I took it to the range and tried several different loads. It did not like anything in the 55 gr bullets. Seemed like my best results are going to be with a 69 gr SMK. I had some loaded with 25.3 Varget which were just OK. I had 6 old loads with 24 gr of 4895. They grouped pretty well. Does anybody with a similiar barrel have any loads that worked real well for them? I am a newbie to this site and appreciate any help you can give me.