Wanted: Looking for rimfire ammo custom-something?

I have a bunch of old rimfires in defunct calibers, including 25 Stevens and 22 Winchester Auto and all the short and long versions of everything. 

I know reloading isn't possible, but for my 32, they make reloadable cases, and you can get the bullets and primers to make it work. 

I'm hoping to find someone who knows well enough how to do something similar for other calibers, or just a proper nerd who would be willing to try. 

Happy to discuss arrangements.