Because this is a separate forum just for case forming, I thought I'd post some info here that is in another thread. The other thread was initially just about the 22 R2 Lovell cartridge, but much of it evolved into how to make these old cases. So here's a link in this forum for anyone who wants that info. The discussion about case conversions starts on page 3.
https://castboolits.gunloads.com/sho...riations/page3