My old copy of Cartridges of the World (1965 Edition) speaks a little about the 11mm French Ordnance revolver and its ammunition.
It states "The 11mm French round is another one not very much different than the .44 S&W Russian. Satisfactory ammunition can probably be made by shortening and reforming .44 S&W Special brass. There really isn't an entirely satisfactory bullet for this particular cartridge." 'Factory ballistics 180 grain bullet at 695 feet per second from black powder.'
Good luck with the project.