I finally solved my 32 Long problem thanks to Mario, a guy I encountered on a BP forum in France. He makes his own custom bullets, brass and even dies for obsolete calibers! He is going to make me a batch of 32 Long, I am waiting for a first dozen soon to try them out and refine the specs before he goes mass production. Look at what he has made to load his 1873 "tabatière" army rifle:
Impressive isn't it? I don't know the caliber but it looks huge. Thanks all for your advice,
Pat