Re: funny ring on .223 cases
If I understand you correctly, I notice a similar ring on some of my cases. I've poked around in there with a bent paper clip but can't feel any evidence of separation. I've come to the conclusion that the ring is where the die "stops" when sizing the case. Even if you're not using a full length die to bump the shoulder back, maybe it still leaves that ring.
Anybody with more experience than I have an opinion?