Are you consistent with your stroke of the powder measure? I throw a charge and then tap the handle twice between charges. This seems to make charge weights very consistent. I have varied the way I throw a charge and noticed quite a bit of variance in charge weights.
....and 1 grain can be a huge problem in a 4-6gr charge weight.
....and 1 grain can be a huge problem in a 4-6gr charge weight.
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