I've been reloading for decades and never had any 9MM brass fail after two firings. I don't remember the original brand ammo, but this was reloaded and fired once by me at a tame 5.0Gr CFE-Pistol with an Everglades FMJ 124Gr RN bullet - 1.160 OAL. Velocity was 1050 ish.
I just reloaded a 125 round batch and had one that wouldn't fit in Wilson gauge so upon closer inspection - this is what I see. I'm pretty sure it wasn't split until I reloaded it. I had good flair as I was using a bullet drop on a progressive. I suppose I could have missed it on the initial inspection of the brass after tumbling.
Just looking for opinions and What to do - with the remaining 124 already loaded. Maybe discard after this third firing? or could this just be a fluke.
TIA