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suthdj wrote:Theory- If we know how fast the powder burns, how fast it travels up the barrel. how long the barrel is, you should be able to calculate the point at which the burning powder is doing nothing(bullet left the barrel)

Mind you I know nothing. It is just an idea.

Doesn't quite work that way. "Internal Ballistics" involve some VERY weird math. Generally speaking, your best resource is the powder manufacturer, who can give you an idea of powder burn rates and what you would approximately get depending on cartridge and length of barrel. Me, I would be FAR less worried about unburnt powder than I would be with overpressure situations, with modern propellants.

jimlongley wrote: BTW, lately I have tried a BP "substitute" only to discover that it REALLY is a poor substitute if you are using a flintlock.

Friends don't let friends use "fake" black powder in their smokepoles

That reminds me, I'm WAY overdue to take my black powder toys out and have some fun. I need to cast some more minies and go have a blast