Should also add, to be certain no one missed it:
"De-coppering agents" aren't novel in any way. The Winchester powders have been using them for a bare minimum of 15 years, and I wouldn't be surprised if it's been twice that long or longer. This suggests that the Hodgy-branded powders made by Winchester (formerly Olin, then Primex, now General Dynamics) have had this property for a similarly long time, unless Hodgy didn't want it.
Thales is using de-coppering agents in their spherical powders (made in Belgium by their PB Clermont business unit, suppliers of at least some Ramshot powders), and they are likely using bismuth rather than tin, but the idea's not at all new. The marketing does seem to be novel, though.
