I recently reloaded 75 rounds from once fired HOrnday reloading brass (i.e. it wasn't factory loaded ammo first) and I noticed several pieces had large primer pockets where the primers seated with no effort at all and two where the primers were lose. They all went in the bin but for you progressive reloaders, watch out. I'm lucky I only use a Co-Ax or else I might have missed them.
Good luck.
Good luck.