Thread: Ring/groove at base of case shoulder

Sorry. Sized I meant trimmed. FL sizing. Norma brass. Perhaps reloaded 6-7 times. Cases chamber ok. Group I shot this morning in 308 thread had them as does brass ready to shoot. It is quite a cut groove. I will check again but definitely will end up with case separation. I will try new brass and see what happens - bit baffled by this. I thought my outside deburrer might have done it but comes nowhere near it.