7.62 X 25 Brass
I have been told you can form 7.62X25 Tok Brass from .223 Rem or 5.56 casings using a forming die from RCBS and a 30 caliber reamer.
I have not tried this, but the process would be labor intensive and with my ratio of success in finding brass ejected from my CZ-52 I would probably loose half of my hand-made cases on the first range trip. The CZ-52 REALLY flings the brass.