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Message: <blockquote data-quote="Paul Box" data-source="post: 4347903" data-attributes="member: 53685">What you are seeing is the powder obtaining moisture from the ambient air and expanding.Is it a problem to shoot? No not at all if you maintain the way your manipulating it as you stated.Do not remix back into the original container or mix with new after the fact. It's really not gonna be that much of a deal if you do.Also, is the fact that Blackthorn is a black powder substitute, not black powder it contains salts ie. (Potassium Perchlorate) and is very corrosive to metals if not cleaned and removed properly solvents won't do it. It's also very inconsistent in granular size so it sucks up moisture like a ***** sometimes.I shot Pyrodex Select for years and it did the exact same thing. I've used a chrono and the velocities and accuracy was not effected by the expansion at least at a 100 yards.Depending on which powder your measuring and how you measure it, that can complicate things.Black powder 1 Fg is a finer grain and 4 Fg is much more course of a grain and will throw of different weights on a scale versus measuring by volume by up to 20% or so. The thing is with real black powder leave no gap between projectile and powder.I highly suggest the same with a substitute.</blockquote>