Make sure the rotor cycles all the way like Waldog suggested. The little metal baffle piece that goes in the powder hopper tube, pull that out and give it a quick rub down with a dryer sheet. May not hurt to give the rest of the inside of the clear tube a rubdown with the dryer sheet as well.
I use that powder and it meters pretty consistantly. I do find myself every few rounds giving the powder measure hopper a quick tap with my finger just to help it flow downwards. Its probably unnecessary but its just a habit I seem to have developed from getting 800x to meter decently in my 10mm loads.
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