Put one or two grains of smokeless powder in a ashtray. Light a match and put it on top of the pile. Don’t worry it is not going to explode. When it finally starts burning it looks like sparklers you use on the 4th of July.
A pile of powder is fairly harmless & will not
explode, but powder fluffed up & confined in a chamber of air is another thing.
Take a handful of sawdust & toss on a burning candle. Doesn't explode, but makes quite a flash. For that matter, even metal shavings will flash when tossed loosely on a flame. Why would nitrocellulose (or other type of powder) not flash if there is enough of it?
Bob - Going to the Dawsonville match this month?