Picked up a new Windham Weaponry Varmint Exterminator. Tuned the trigger to 2lbs, dropped in an Accu Wedge, mounted a new Leupold and set out to working up a load. Rifle is 1/8 twist so started with Hornady 68 and 75 bthp's. I've loaded '335, Varget, Tac, '15 and H4895. All powders group the same 1.5" or so @100 with the first manually loaded round going off by itself followed by shots 2-5 creating two good two shot separate groups. I can live with the first round issue, it's not an uncommon issue in my experience, but never seen an AR split the remainder of the group into two separate groups. The rifle looks like it wants to shoot, shots 2 and 3 will be touching as will shots 4 and 5, they're just separated. Where to begin troubleshooting?
