That is Russian made ammo, that was captured by Yugoslavia and repackaged for sale (the Yugoslavians kept with the 8mm). The Yugoslavians took the ammo, pulled the bullets and took out the powder, polished the cases, replaced the primers, then reloaded the ammo. This is why you see all different kinds of headstamps in one box, and also why the primers look so new. The bullets are lead core, steel jacketed and then copperwashed. It is light ball, 147gr. This Russian captured ammunition is reffered to as the M-908 (C) load.
Im sorry to dissapoint you, but you should also know that this ammunition has a reputation of bad accuracy. I have a box myself, but haven't shot it... but the reports aren't good.
It is also interesting to note that the Yugoslavians personally made a brass cased 182gr. load for sale to other countries- this is the M-30 (J) load.