Boy do I feel like an idiot. It helps to read instructions that come with the dies, doesn’t it? The instructions say 1. put shell holder in place, 2. raise ram, 3. Screw in die until it touches shell holder, 4. Lower ram, 5. Screw die in additional ¼ turn, 6. then lock in place.
I skipped part 5.
Dummy.
So this might explain the inconsistent chronograph readings + - 50 fps, and the lousy groups. Learning the hard way, so I never forget.
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