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So HF powder not good for tumbling PC bullets .?? ...
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No it is not. Only Red is half-way good for tumbling, albeit great for use with an Electro Static (ES) gun. However, even when tumbled, the finished coating will be thinner than powders available from places like Smoke's. Also with HF Red, the color gets darker as it is being used (shaken) over and over leading me to conclude that the abrasiveness of the HF Red powder is grinding away on the lead bullets and the lead swarf is darkening the powder. It seems to go from Red to more of a Maroon so I reserve it's use to my ES gun.