Illinois requires a Magazine Keepers Certificate. After a Federal Explosives License from the BATF is obtained which takes about a year, then Illinois requires a certificate from Illinois Department of Natural Resorces. A magazine which meets ATF and DNR requirements will be inspected and a payment with application sent to the Il. DNR. After 6-12 months a yearly certificate should arrive. Problem is that the certificate normally expires before a renewal certificate arrives. It's no doubt intentional to prevent magazine owners from legally having or selling black powder. Total amount an individual can have is only 5 pounds without proper paperwork. This includes primers or percussion caps. As a class 29 FEL Dealer of Black Powder it is an uncertain situation to keep up with. It would be easy to be legal one day then get busted the next if certificates aren't reissued on time. It's just another form of gun control. If there isn't powder or ammo to shoot, then the gun is only a club.