Thanks Pyro,
That photo answered a question I've had for a long time. I've got a Hispano shell and casing at home that my father brought home from his service in WWII. Looks exactly like the one in the picture. I never knew what it was.
[EDIT] He was an AA gunner in the Merchant Marines after a stint in the Army Infantry. He told me it was an AA shell, but I never knew what kind.