Keep your up and down strokes even between throws - On the dumping stroke, give the lever an extra bump to release any powder which might be clotting insider the channel. Also help to dismantle the powder measure, clean it out with a de-greaser/anti-static agent and then coat the channel the disk and the inside of the frame with graphite. This would smooth up up things. Lastly make sure you use the large nozzle at the bottom of the powder measure.
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