What is the quality of this ammunition? Where is it from? I saw some in 7x57 175 grain that I thought of trying just for fun. Thanks in advance.

I found this, I hope it helps.

I have used them in my 7x64 before war in Bosnia (pre 1992) - and they proved much more accurate than Prvi partizan from Uzice (Serbia) - bullets are regular softs similar to Speer. I don't know about recent quality tho.

P.S. FYK - their factory is on Igman hill (close to Olympic complex) above Sarajevo and it was one of the Serbian strongholds from where they have targeted Sarajevo.

Igman is still very accurate ammo with quite strong SP bullets comparing to some well known brands.
It is better than PPU but they don't have some great big game bullet as PPU has Grom.