Steel case ammo seals the chamber only when pressure get HIGH.... until then: gas, soot, crud blows by the case into the receiver.FWIW:
I use Lubiplate on Carbines: that might explain some of the difference.
The other thing that I noticed was the large ( OK , huge ) amount of crud that Wolf blew back into the bolt face cavities around the extractor and ejector.
I've had good luck with Wolf in my carbines. It certainly isn't National Match quality but it gives pretty good groups and, most important it's cheap and (usually) available (considering China is buying up all the metal in the world).
Keep in mind carbines aren't very accurate anyway much beyond 50 yards, so expensive ammo is wasted at longer ranges.
The only caution I would give is that Wolf is a very dirty ammo and it is essential you clean the gas piston and area around it every time you shoot. Carbon buildup will cause the action to become sluggish and Wolf produces plenty of carbon residue.
In the "Wish I'd Said That" department: "With Wolf ammo, the Russians found a way to make dirt explode!"