Wolf and clean guns...
I've shot Wolf in my Makarov and my Saiga rifle... it goes bang every time so far... and it's some of the cheapest ammo I've been able to find. I'm guessing that the 9x18 and 7.62x39 being "bloc" loads, the ammo tends to run fine in them.
Just a guess, but I think most gun designers tend to design their guns to match the generic cartridge they have available in a particular caliber, and that's probably why the guns from the former communist countries do well with the Wolf ammo. It runs fine in my SKS and PA-63 as well.
As for ammo being "dirty"... that's why they sell powder solvent and patches. I've got lots of guns, but none of them are self-cleaning. I've bought a number of guns that were shot previously and never cleaned that the previous owners claimed something was wrong with the gun... but after a good cleaning, it ran fine. The first thing I do after buying a used gun is take it apart and clean it, so I can examine all the parts to see if I need to order anything. You wouldn't believe how much powder and gunk I've taken off of parts and from underneath grips that never got cleaned out.
A little cold blue, oil, and effort, and you wouldn't recognize some of the firearms I've bought. "Holster wear" is easily fixed with a little cold blue, and while Wolf ammo might be "dirty", it's the shooter that's responsible to keep the weapon clean... not the ammo. We used to shoot cases of "corrosive ammo" and clean the guns afterward without any ill effects to the barrels or parts.
You might not want to use "dirty" ammo in a firefight, or in a war zone, but for generic, range shooting... it's just fine. My guns get dirty no matter what I shoot.
WT