FWIW Go up in .2's of a grain up to max and see where you get, some cases only really work when they are loaded up besides you may strike another node point and get an even tighter grouping also trying another powder is not a bad thing I have loads for 4 different powders (Thank goodness for excel spreadsheets) for each of my centrefires as when one supply dwindles you can swap to another and carry on. Means more range time and reloading but hell that's what it is all about, still reckon crimping may not be a bad thing JAT