Acquire some Alliant Black Mz & you'll give the BlkHorn 209 away.
Black MZ is repackaged American Pioneer powder. Alliant no longer markets it, but if you want some get Shooters World Multi Purpose Black loose powder or The Hunter pellets. The American Pioneer loose powder is citrus based and cleans easily, but is bad to absorb moisture. It may clump in the can after it has been opened. I bought several pounds of the Black MZ from Sportsmans Warehouse for use in black powder shotguns at $10 per pound.
