I'm sure liking the idea of a thick walled, "everlasting" honker of a case, with an internal "shelf" whereupon a proper flat based bullet can settle in well aligned repose. Can't BELIEVE that DD is talking heeled bullets,...I see them as case killers, myself.
Seriously looking at .32 cal, in I.D. sleeved .38 cases,......silver soldering the sleeves in was the original thoughts, but I'm now looking at some super tough ceramic filled epoxy that should pack the gear , as far as assembling the case components.
.......once the sleeves are prototyped, tested, proven,.....I'd be looking for a small job shop running a CNC Swiss screw machine with bar feed,.....hopefully using off the shelf thick wall tube stock.

GTC

Last edited by crossfireoops; 05/30/17.
Member, Clan of the Border Rats
-- “Sometimes I wonder whether the world is being run by smart people who are putting us on or by imbeciles who really mean it.”- Mark Twain