How often do you clean the bore? I find they shoot tighter with more fouling, a lot of people clean too much. Have you adjusted your accutrigger? Try some eley edge, match or tenex, lapua centerx and any other high grade match round. The group you posted is about what I get with me MKII at 100 yards but I have been shooting that gun alot, I also use a bipod and rear bag. Keep trying and I bet you'll tighten em up.
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