I was watching some videos on the Ultimate a few weeks back and that was one of the 'features'.....they fired a whack of bullets with BH209 and the bore was spotless, no blow back and the primer/cartridge was clean. The guy was impressed.
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Bh209 is the premium powder at a premium price ! Still haven't seen how you prime those thing's in the field or range ? I dollar stored 30 small plastic snap cap container's for $4 then let my auto dispenser go for 43 gr. charge. And get 2x plus the amount of loading's per pound of powder compared to BP , but am missing the coolness of the smoke and smell !!