Experimental cartridge for a Berthier rifle, probably for Turkey.
Bullet shown at 200% scale
Shown below is drawing 7021 from SFM made in June 1891 that shows the “Turkish cartridge for Mr. Berthier” with cylinder-ogival bullet and drawing 8088E showing “Berthier Bullets Mod 1906 for Turkish rifle (Mauser) Caliber 7.65”