Black powder is an explosive chemical. Smokeless is a "progressive burning" chemical is my understanding. I'm not sure what Goex is considered.
Hazmat all, unless confined in a cartridge.
Maybe you could pour the barrel full of powder, put a wad in the muzzle, and pass it off as a "cartridge", then on arrival, unstopper it, pour the powder out and use in amounts required.........
Let me know your release date, and I'll drink a Pepsi to you then.
