Promo uses the same data as R/D - but may weigh differently with the same bushing - it must be weighed with a scale. Some claim it burns a little more dirty than R/D but that has never bothered me. After shooting black powder for over 40 years all nitro seems clean to me. My last 8#'s was 80$ compared to 700X going for 105, so if you're shooting a lot it makes a difference.
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Paul Harm
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