I only first noticed the splitt cases after one got stuck in the breech, when I realised what was happening I weny through a few hundred previously spent cases, as I keep them in the pocket of my car, if that one case hadn't got stuck I would never have known, and I would be one of the people saying it never happened to me.There's no big deal about it happening, two of my friend's have found split cases as well, one is using an Anschutz, the other han a C.Z., and i'm using a Marlin.