The Harbor Freight powders are actually reclaimed powder, not new manufacture. You can get good powder from Eastwood or Powder by the Pound. Gloss powders are more durable than flat or matte finish powders.
I have had excellent results tumbling bullets in peanut butter jars with screw on lids. I always wrap a layer of electrical tape around the lid to prevent leakage.
BTW, what your best time knocking pins down?
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