8mm Mauser (8x57JS or 7.92x57mm) is not the same cartridge as 7x57mm. Your ammo situation will depend upon your location. In the US, you can find 8x57 relatively easily as there is a wide amount of surplus ammo available online and both PPU and Sellier & Bellot also manufacture new production ammo as well. The sights on the K98k are regulated for the s.S. Patrone which has a 198gr bullet travelling around 2500 fps.Hi all, I'm looking to pick up a K98k in the near future and am wondering about ammo. The gun I'm looking at is chambered in 8mm Mauser (7.92x57mm), how available is this ammo? Is this the same thing as 7x57mm that's widely available?