Looks like French Poudre BN3F has quite the evolution. Poudre B(Blanche) or B(General Georges Ernest Jean-Marie Boulanger) in the mid 1880s(1884??)

Then it morphed to BF(Blanche Fusil). On to BF(NT) - Blanche Fusil Nouveau Type. Followed by BF(AM) - Blanche Fusil Améliorée (improved) in 1896.

1898 - BN3F arrived on the scene with >>3 was to show the addition of a slight amount of potassium nitrate or barium to the powder and was stabilized with antioxidant diphenylamine instead of amyl alcohol.<<.

1917 found BN3F to BN3F(AE) to be in common usage.

Much more reading to do....

Hochachtungsvoll,

Raimey
rse