Ah, I finally found it: >>Poudre Vive<<, an early moniker for Semi-Smokeless Nitro Powders. So yes, still in the language of French.

With the advent of the optional >>Poudre Vive<<, then is is most likely that such a platform experienced up to 5 Proof Efforts, with the last couple being Optional.


Serbus,

Raimey
rse