All that brass residue could be the result of expanding the case mouth too much. A simple way of telling when your finished round has just enough taper "crimp" - actually just enough of any remaining flare removed - is shown below:
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I use this single edge razor blade method to set my taper crimp die, measuring the case mouth OD only occasionally and then only to satisfy my curiosity.
That "pop" you feel in the press handle when removing the finished round makes me think the round is being forced into the crimp die to far and the case mouth is going up beyond the crimping (tapered) section.
When you can measure what you are speaking about, and express it in numbers, you know something about it; but when you cannot measure it, when you cannot express it in numbers, your knowledge is of a meagre and unsatisfactory kind. [Lord Kelvin]
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