Some of my readers share my addiction to sending small objects out-bound at high rates of speed. And no, I don't mean hitting golf balls.
Smokeless powder is one of the components used to reload ammo. Supplies of smokeless powder have been spotty.
hi-techammo has CSB-1 on sale, four pounds for $80.
Scroll about half way down THIS page. Shipping and HazMat charges apply.
More information about CSB-1 powder HERE.
hi-techammo advises the use of Hodgdon Universal loading data for CSB-1. Universal burn rate is between Alliant Unique and Alliant Power Pistol.
Also, Graf's has Re-15, limit four pounds.