you just load MORE ammo, and start collecting all these orphan calibers and trimming and resizing other cases to fit . . .
Been there, still doing that. (Ever tried to find .455 Webley hulls? I had a terrible time until an outfit in Wisconsin started turning them down from new .45 Long Colt brass. I can trim the cases but I can't grind the rims down - the .455 rim is very thin for some reason.)
I don't have time to reload standard caliber stuff, let alone "exotics".