[Talisker]

M65 Atomic Cannon ("Atomic Annie")

After a few drinks with a Los Alamos newkyewler program manager, this atomic cannon came up in the conversation.

He couldn't stop laughing.

[moonshot925]

There was also the W-23 naval nuclear artillery shell, deliverable from the 16 inch guns of an Iowa-class battleship.

Yes. Development began in 1952 and the first W23 projectile was delivered in 1956. A total of 50 were produced. USS Iowa, USS New Jersey and USS Wisconsin had an alteration made to Turret II magazine to incorporate a secure storage area for these projectiles(USS Missouri was decommissioned in 1955 which is why she was not altered). This meant that an Iowa class battleship could fire several Hiroshima sized weapons to a range of up to 23 miles and have them hit target very accurately.