Berdan SS that is one beauty of a K98 you have there!
All I have shot out of my Mauser is corrosive ammo with the exception of some Remington Round nose. The Remington shot like crap and just peppered the target. Probably an 8" or better group with the Remington and I don't know why? Surplus ammo has been the least expensive, but it has pretty much dried up. I want to get some of the 90's manufactured Yugo sniper grade ammo to see if my groups will tighten up.