I've been told it is RD but the grain size isn't as uniform as RD and that's why you have to check each new batch with a scale. Guess they save a little by not keeping as close a tolerance. Dirty, only till the next shot blows the old dirt out and leaves some new. There's some residue left, but not enough to worry about. People wanta talk about dirty barrels, they need to shoot BP - now there's some dirty barrels.
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Paul Harm
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