Here are some photos of big-bore coiled-case cartridges in my collection:
a US 105mm Howitzer - I know the 105mm was fielded, but from when to when?
US Experimental 40mm Bofors L/60:
The head of the Bofors case:
An experimental West German 50mm case
I am currently researching a book on coiled-case ammunition through the years. If you know of any others like these, or have any information on the development of these 20th century coiled steel cases, it would help fill a very large gap in the story. Message me here or via email.