Wolf ammo is made in the old Soviet ammo plants along with Brown Bear, Silver Bear, ect. The name on the box is the importers brand. Some Wolf, like the 22lr is made in Germany, and their shotshells are made in Spain. The only centerfire ammo not Russian is the 380 ACP (spain) and their Gold Line which is brass cased(Serbian)
Its good ammo for plinking and practicing, and if your gun is not picky it can be used in a pinch for hunting. I have used the 55gr hollow point ammo for some varmints with decent success. They do seem to use propellants that are dirty and there are two different lines, the military classic and the black box. The military classic is usually a little underloaded and the jacketing may be bi metal (steel and copper) instead of the jacketing you are used to which is just copper. I have also seen some military classic with the laquer coating still. Only the 223 seems to use the polymer coating in this line.
I have had more reliability out of this Russian ammo than I have with the cheap Winchester White Box line at Wal Mart. I had several boxes of WWB 9mm that had deformed or lazy rounds in them.
As for the dirty thing, you should clean your gun after every use anyways so a little more dirt wont hurt.