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I'm not sure where this came from. Pyrodex, particularly Pyrodex P [the P stands for pistol] works just fine in a percussion gun of any kind. It does NOT work well, if at all, in a flintlock pan, as the ignition temperature for Pyrodex is way higher than that of black powder and the spark does not ignite it well...
I've been shooting 99% Pyrodex in my couple of percussion revolvers since March 2nd, 1986, and for four years before that in Berlin, shooting somebody else's. BP, being an explosive, was prohibited in Berlin under the Four Power Agreement limiting access to military calibre firearms and explosives for civilians [I was not a civilian, but I WAS a member of BSN Heros, a civilian club, that shot at Rose Ranges in the US Sector]/ All there was, was Pyrodex, and we shot a TON of it. I shoot two loads - 24gr and 30gr, but NO wad and NO grease, just an emoluent water-based handcream called E45. It washes away when cleaning, taking all the crud with it. Do NOT use ANY kind of petroleum-based grease on the cylinder axis pin - the heat will turn it to a solid mass of coked-on carbon.
As an example, here is Pyrodex P not working in a Ruger Old Army -
From the Hodgdon reloading guide [they make the stuff, BTW] -
Hodgdon Pyrodex P is intended to be a direct replacement for FFFg Black powder when measured volumetrically using a black powder measure. The principal uses for Pyrodex P are in muzzleloading pistols, cap and ball revolvers, and in small bore, muzzleloading rifles.
I know it works great. However, I've had traditionalist types tell me pyrodex is garbage. What they don't know is I've probably fired off way more Pyrodex than they could even imagine. I guess if we want to go by years and dates, 1979 was the first time I fired a black powder pistol. Later in '87 I got one of my own. So yes Tac, I know it works just fine in a cap and ball revolver.