To me both of them are the same. I have no problem with both of them but other seems to have. My AK loves them, then again my AK eat any brand of ammo alive.
I have 4 sks's & 2 ak's .Used about every brand over the years.I BUY as cheap as I can,use a homemade chamber brush about every 5 mags.clean gas tube when bolt will not cycle(or acts sluggish.HAVE FUN
I use them both regularly and find them to be pretty much equal. I have been using Wolf more due to the lower price. If I had to choose one for long-term storage, Barnaul is better suited in that respect............
I picked up some Brass cased South African ammo a while back at a gun show and it functioned flawlessly. You can usually find it in the shotgun news or other such publications for a real good price.
I havent noticed any brass getting chewed up or anything..I inspected the cases and they seemed fine. I dont reload it because I have seen it as cheap as 2.99 a box