Powder production, at that time, in France was a monopoly of the French government. Arms were proofed with black powder, until semi smokeless and true smokeless powder loads were developed. Powder J, including J1 and J2 and powder S, were in use beginning in 1896. Powders M, R, and S were in use in 1898, and powder T in 1900. Only powder T is a true smokeless powder, and an early problem was getting the new powders to actually develop the 12,000 psi minimum that was set by the Brussels convention.
If you are asking me to define the ratio of black to smokeless powder in early French produced powder and proof loads, I dont have that information. You appear to have a clear understanding of what semi smokeless powder is, however.
The early semi smokeless powders used at the proofhouse, prior to powder T, werent in use very long.
Ive never seen a French proofed barrel with 5 crossed palms, either. I know what four represent, triple proof with black powder, to 27,000psi. Try that with your sleever.
I have no idea what five crossed palms represent. But, I wouldnt worry about what I shot out of it either.
Best,
Ted