Found from an estate sale... They're RCBS 30 Carbine dies... a 3-die set... clearly, the decapper is missing from the sizing die, but there's a belling die and it has a decapper on it.... That decapper doesn't fit the sizing die, only the belling die.
I haven't see this kind of setup before; have I lived a sheltered life??? Why is there a decapper on the belling die?
Attachment 229175