I've never had any problem with steel cased ammo of any brand. Most of it has been Wolf, and yes its kinda dirty, and its not match ammo, but I'm able to hit targets out to 100 yards consistantly, which is just about the limit for these old eyes of mine.
I heard a rumor a few years that the lacquer coating on the steel cased rifle cartridges will melt under rapid fire when the chamber got hot and gum up the chamber. But that was it, just a rumor. I've not had narry a problem with my AK, nor SKS's shooting lacquer coated, steel cased ammo.
Just my two cents worth.