For that rifle i would just go commercial ppu 8mm fmj. Or hornady.
Skip the surplus.
Romanian surplus is absolute junk. I have a few cases. Minute of barn literally. Skip it.
Yugo surplus is ok but corrosive. But it shoots well for me.
Turkish is hot as hell. Not safe for autoloaders.
No idea on greek. But it seems to get good reviews.
Also Cool build op
Edit: i would also get some dies and reload for it. 8mm js is a great caliber with the right loads.