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feb 14, 2018 powerful black powder can be made with mill runs of between and hours. use long drop cords. unplug the cords at the electrical source, not at the ball mill, when you want to stop the mill. run your mill remotely, outdoors, at least 150 feet away from people and inhabited buildings.how to pack a backpack the right way rei co-op. sleeping pad any layers, like long underwear, that you plan to sleep in; camp shoes or down booties packing this kind of soft, squishy gear at the bottom also creates a kind of internal shock-absorption system for your back and your pack.