I made an erroneous statement re compressing black powder. It shouldn't be done when using duplex loads for BP cartridge loads, but is ok when just pure BP or BP substitute. I read on another website forum that a guy was able to get 70 gr of fffg into the 45-70 using a drop tube and compressing the powder slightly. This was with a 405 gr bullet. BTW, if you're going for smoke IMHO I think the real BP smokes most followed by Pyrodex.
Mike
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