This won't help, but the Serbo-Croatian language is written in Cyrillic for the Serbs, and our Roman alphabet for the Croatians.
I've not read that the Croatians ever manufactured ammo. If not, it's too bad, because the words could be translated with an Internet dictionary.
For the Cyrillic used by Bulgarians, Serbs and Russians, I doubt that there is any way to translate on the Internet, unless you have the correct keyboard.
With my Czech 8mm Mauser ammo, some words resemble some of those on Yugo boxes.