I went back to the range and took some different ammo. To my surprise my mauser shot better groups with the Yugo surplus than any other ammo I tried. All the mentioned shots were from 100 yards.
S&B 196 grain: 1 five shot group was 3 1/2"
Romanian surplus: 5 five shot groups, largest was around 5" and smallest around 4"
Yugo surplus: 5 five shot groups, largest was 3 1/2" while the smallest group was 2" the other groups averaged around 3" per five shot group. Always that one flyer that would opent the group up!
I had a lot of vertical stringing, but not much horizontal. The horizontal width on most groups was under 3", it was the vertical stringing that caused the groups to be so big. Is this me or the rifle? Sometimes I felt like I was messing up the elevation a bit and that the rifle could shoot much better than me.