New hobby

Eric Revo

Old Mossy Horns
My guess is no one is desperate enough to buy powder from broken down handloads!
I'd bet you could put an add on Craigslist for "grey gunpowder, guaranteed to go boom" and you'd have calls from all kinds of folks. Maybe even get a ride in a black SUV to an undisclosed location for a "chat".
Probably better to dispose of it the way you did .;)