The shells appear to be early-1940s US 37MM Gun base-fuzed shells. I am reasonably sure they are not APC (Solid-Shot) because that kind has a sharply-pointed aluminum "windshield" which covers most of its nose.
I think Bart (John D. Bartleson Jr.) is more knowledgeable about 20th-Century artillery projectiles than I am. Perhaps he can shed some light on their ID if I am incorrect.
Regards,
Pete