Revoltella
Moderator
I was originally going to suggest .223, until your location in Austria came up. I don't know how available .223 Rem is there, but 5.56 is a NATO round so should be available. Problem is, most bolt rifles are chambered in .223, not 5.56 and it's not considered a good idea to shoot 5.56 in rifles chambered in .223.
So I'm going to suggest .308. 7.62 NATO is safe to shoot in a .308 chambered rifle.
So I'm going to suggest .308. 7.62 NATO is safe to shoot in a .308 chambered rifle.