All mine are loaded, but for the dummy which also shows a taper crimped paper topwad.
Don’t know which weapons / case types it was used.
There is also a shorter variation, same dia. but 1.040" OAL. It exists (to my knowledge) in two variations; a solid case like the one you have & the other with 4 rows of holes, alternating between one mid-case hole & two holes (1 below & 1 above the single hole) per row, a sort-of mini artillery primer.
I only have one of the multi-hole style & fired, it shows no headstamp. Another “normal solid case” has U . M . C . [120º spacing + the “dots” in between the letters are also at 120º from each other] impressed into the brass primer cup. Very neat primer marking.
Not sure what these would be for but I’d expect 20mm to perhaps 37mm case types