ammo88The Gewehr 88 (commonly called the Model 1888 commission rifle) was a late 19th-century German bolt-action rifle, adopted in 1888.. The invention of smokeless powder in the late 19thCartridgeCaliber: Patrone 88 - A.k.a. M88, 8x57J 8x57 I, 7.92x57mm, 8mm Mauser, - .318 in. dia -Type: Collectible Military Surplus; Mixed Headstamp M1888 (Gewehr 88 Rifle) Ammunition - This is early 8mm Mauser ammunition