Mn State laws
The possession, storage and use of not more than 1 pound (0.454 kg) of commercially manufactured sporting black powder, 20 pounds (9 kg) of smokeless powder and 10,000 small arms primers for hand loading of small arms ammunition for personal consumption.
apparently fire departments can come in and remove excess at your expense.

So I'm not allowed to buy a second can of black before I run out? Don't think I have black anymore anyways. Gave it to the needy during the shortage.