Actually, I was referring to metal-on-metal sparking rather than static sparks. I am aware of the studies where BP has been exposed to static sparking without ignition. Sparks generated by metal-on-metal contact, however are, as you probably know, actually minute fragments of hot metal like a flint on frizzen spark. Besides, the wiper arrangement in the Lee Perfect Powder measure doesn't cut or crush the grains like many rotary measures with metal drums. I have found it to give very repeatable loads, and it is cheap!