[jim brady]

As everyone else has said, your rifle is 8X57 caliber. Most of the milsurp ammo that I've seen has been stored under less than optimum conditions, and those old primers never seem to be quite up-to-standard for consistency.

I managed to buy serveral sealed cases of 1935 and 1936 German 8X57 ball ammo very cheap from J&G Sales, and also some Turkisk suprlus ball ammo. The Turk stuff was sure-fire but really dirty shooting, and the German ammo primers were mostly hang-fire or misfires. Bought a couple hundred new Winchester 8X57 cases and primed them with modern Remington primers. Pulled the bullets and used the powder charges as-is and reloaded into the new cases. Pretty darned accurate results thru a K98K. Got rid of the corrosive primers - guys at the local Gun Show were eager to snap the old unfied cases up, even when I told them about the hang-fires and mis-fires. Go figure.

I've seen "Match" surplus 8mm ammo advertised, but I think that is mostly hype for ammo that had been stored properly.