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I generally start with a .070" jump to find a decent powder charge then walk it in .010" at a time to find best accuracy, generally I find it somewhere between .020" and .040". This load in particular seems to be best at .050" for whatever reason. I tested some loads today and the groups slowly tightened up until I hit that point, then marginally opened up until I hit .020". At that point the group opened up to 1.5" and .010" was even worse.
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