The “replica” powders.
The ONLY reason that BP is listed as a class A explosive is that it has a low ignition temperature. The “new” replica stuff (none of it really is new) have a much higher ignition temp and thus not an “explosive”.
The high ignition temp and burn rate more like progressive smokeless make the replicas unusable in flintlock ignition. This is why the companies making caps have increased the compound in percussion caps and/or use a compound with a longer flame. Neither is needed and may even be detrimental with actual BP.
Bill Knight told me some years back when it hit the market that Old Enysford (?) has something added to it but his illness kept him from digging into it. Mostly because it’s smoke smells different than other blackpowders. He suspected “something new had been added” to get it to perform more like Swiss since Goex could not get the charcoal here that the European powder makers generally uise. At least that what he told me. So I see it as a “replica” powder as well. I don’t even know if the fireworks company will even keep making it. I stopped using GOEX as soon as I could for personal reasons.
And the fact that the Moosic made powder was $#@*.
