I've shot several metric calibers in the Privi Partizan factory ammo with good results, also the 75gr .223 match. Haven't reloaded any of it yet though. It looks like good brass. Probably will load 7.5 Swiss first. I want to try some 150gr bullets.
I have loaded a lot for the 7.5X55 Swiss. I have three K-31's. I have found that the Prvi Partizan cases are great and really last. I have also found that all the accuracy loads that are listed in the Sierra manual for the 7.5X55 Swiss are really accurate. The OAL that they list are too long for the K-31's though.
I have wone a number of military rifle bench rest matches with this load.
45.0 grs IMR 4064, Prvi case, Fed. 210M primer, 155 gr Nosler custom competition HPBT OAL 2.880 and I use a Lee Factory Crimp Die on this load because it makes it more accurate for me.
From 125 gr to 168 gr bullets IMR 4064 seems to be the powder.