I prolly have loaded PPU brass, but I'll use just about any brass and haven't found a really "bad" one yet. If you are curious about primer pocket crimps, just look at the case head. If there is a circular imprint around the primer pocket mouth, it's crimped. If there are three or four punch marks around the primer pocket mouth, it's prolly a "stake crimp" (my HXP surplus 30-06 ammo is stake crimped). No need to discard the brass, just run a countersink, case deburring /chamfer tool in the pocket enough to cut out the displaced metal. I've done several thousand military cases this way, but some will suggest a dedicated pocket reforming tool...