I'm voting with Doyle. Recently I was working up loads in one of my rifles for a specific bullet that I wanted to use. Until I changed to a slower powder than I had been using, it would not group acceptably. With the new powder I got great groups. The only change to get me from unhappy to happy was the powder. And I'm not specifically saying that going to a slower powder is the answer to your problem. I'm just suggesting that Doyle has a very good point. Try another powder, or ask the folks on the forum what powder works for them in a similar rifle. That might get you the answer you want.
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