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I've been told that bottleneck (BN) cartridges are a problem with black powder. Supposedly, the design causes uneven ignition and pressure. I was considering the Sharps 40-70 BN or the Sharps 40-90 BN but was told because of the potential problems with bottleneck cartridges and black powder that I should go to the Sharps 40-70 Straight. Anybody know anything about this?