The 8 mm Lebel (8x50Rmm French) was and first smokeless powder cartridge adopted by the military of any country. It is also the one of the most bizarre looking cartridges I have seen.
It was introduced in 1886 and served through WWI. It was made obsolete in 1929 with the introduction of the 7.5x54mm MAS mod. 1929 (7.5 French) cartridge.