Seen this before, not real common. FL sizing .223/5.56 cases and can't tell what it is. Just did around 500 cases, and 2 of them looked like a piece of lead was in the case. Maybe a bullet turned upside down??? Happened a couple years ago, and I broke the decapping pin, and had to replace it.( Dillion carbide die) 1 is a LC-09 case, and the other is headstamped, A -USA .223 Rem. Once fired, original primers, so not sure what or why. Anybody else ever see this??