Anyhow it looks like the RCBS VLD type. Small Centre pilot with 3 curved cutting edges that stick out like claws. Also just like the Lyman kinds that arrive on the Lyman Instrument. I do not know exactly what the chamber spec is, but when the case is too prolonged https://223casing52962.collectblogs.com/81980235/once-fired-223-brass-bulk-no-further-a-mystery