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You do realize that the edge is sharp as it is supposed to cut those grains of powder rather than crush them, right? And, just saying, but there is no way gun powder can cause any nicks or damage to the rotor as the rotor is steel while gun powder clumped up or not is softer than steel.OK - if you remove the 'drum' from the powder measure/thrower and use some 280 ish wetordry sandpaper and slightly bevel the edge of the top opening of the drum it will help to give the powder a slight 'relief' as it passes under the hopper and picks up the charge.