(You need to Login or Register to view media files and links) is the web page of the Spanish Ammunition Collectors Association. 
Well organized, illustrated, and instructive.
Note the page for the .32 Williamson Teatfire. Arguably not a rifle cartridge, but i can imagine folk's reaction if one shows up  at deer camp with a Teatfire. 

The .303 Adder, on the other hand, makes a lot of sense, except that i would use .30-30 brass and a .30 bore.