Spent Ammo

Not sure what weapon fires whatever was in these ammunition cases.  I found them in a crumpled, burnt and rusting pile in the auto graveyard.  From the looks of them
they must have been in a vehicle that caught fire and they cooked off. The casings were all deformed and exhibiting indications of explosive ignition.
Update:  These shell casings were from ammo from a Howitzer... read about it here.