Need CHEEEEP powder suggestion for a Thundermug

Make your own black powder and corn it to your specs for large blasting grains? I can't see a cheap source of black powder in your future otherwise...

-M
 
Find a black powder club/group in your area, or reenactors. They will often get a bulk order shipped to them once a year. Bulk powder usually comes in 25lb mylar bags.
 
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