Sorry, Little David was developed during WWII, swear I remembered it being developed during VN; my bad...
Holy Mother of God.
Link to Info about “Little David”:
http://www.militaryfactory.com/armor/detail.asp?armor_id=296
3,650 lb. projectile. FAR bigger than a 16” naval ordinance.
Unbelievable. Boy, LambSlave, you won the military harware expert post of the thread with that one!