I didn't know what PPU stood for either when I bought 100 rds. of once fired brass for $5 last week. What I DO know is that you don't want to try to decap it with a standard decapping pin. I broke mine trying. Apparrently those cases have crimped primers and need to be decapped with a Lee decapping tool or a hardened steel decapping pin. The brass seems to be of excellent quality.
Prvi Partisan, makes good ammo (made in Serbia) the brass isn't the best in the market, and yes it is a crimped primer, so decaping and re-priming might be a problem. But last year when 62 grain FMC was hard to find as hen's teeth, Prvi Partisan was available from Midway. I am not shooting compitition, but for coyotes and and men they will do what they are made for, kill!