A replacement 'Schultze' powder, ie smokeless 'volume-for-volume' BP equivalent, would be marvellous IMHO, but not as a solid which rules it out for 'N-for-B' cartridge loads.

I have been following the 'Black Mag' -> Clear Shot -> Clean Shot -> 777 evolution for several years now, in utter despair! How hard can it be???

beleg2:
Sounds like your friend was onto something. Can you convince the grandson to sell the 'secret' to a consortium, perhaps organised by Sinner?

Money to be made all round, I suspect...!