OH! I ENTIRELY managed to forget this:

"8mm French Ordnance may be reloaded with resized .32-20 cases." as stated by Wikipedia. Which should, of course, be taken with a grain of salt, at the very least, being Wikipedia, but it's at least a starting point for if and when.

I also quite like another line in that stub of an article, namely "used in the 8mm M1892 revolver and inexpensive handguns manufactured in Belgium and Spain". :P

...!
Stoke Mandeville, Esq & The Victorian Ballsmiths
"Nobody Want Verdigris-Covered Balls!"