I Have a CZ452 ZKM Lux have had it since I was 14. Great little rifle.

As for popular calibres the .223 and .308 would have to be the most common here in Australia. Owing that they are military calibres and there is plenty of surplus ammo around and also they are both pretty well suited for most shooting in Australia... aside from the 12ga of course.

I don't see a lot of the 7.62x39 I honestly haven't seen any bolt action rifles out here chambered for it. I imagine with our gun laws it would raise some eyebrows if anyone ordered ammo for it, especially more than 20 rounds at a time...