I think I have to join the chorus on .223 conversion. I heard that it could be done too, so I used a pipe cutter and ran them through the sizing dies (without the neck expander in place) Trimmed to length, then turned the necks.
after that I annealed the cases and ran them through the sizing die again with the expander button in place.
they work fine. I figure that if the supply of milsurp dries up, I'll still be shooting. Besides, the cast bullet (95 gr) works fine in the carbine and the Nagant revolver too.