Commie ammo for commie guns, US/European ammo for US/European guns.

Wolf runs perfectly in my AK47. Never a hiccup. (So does everything else I've put through it, for that matter). I shoot 1970-1980 surplus Russian in my Mosin Nagant. But in my non-eastern-bloc firearms, I shoot non-eastern-bloc ammo. US and European firearms don't necessarily digest the eastern steel cased stuff so well, but the eastern-bloc guns gobble it up. That's what they were designed to use.

Also, steel cased doesn't expand as much as US/European brass cased. Mixing the two ammos in a US gun can lead to failures (until you clean the chamber). Since the steel doesn't expand much, more gasses blow by, and cause build up in the chamber that in turn causes the subsequent brass cased ammo to not feed or extract reliably. Best to stick with one type of ammo per shooting session, then clean thoroughly between sessions.