The DesMoines class heavies were impressive, even if they did not see combat.

Guns: 8 inch/55 caliber in three triple turrets
Rate of fire: 10 rpgpm (rounds per gun per minute)

90 rounds per minute on the main guns!

Guns: 5 inch/38 caliber in six dual mounts, Mk 32
Guns: 3 inch/50 cal in 11 (originally 12) twin mounts.

http://www.uss-salem.org/museum/history/specss.htm

And the DesMoines (CA-134) is still in the Philly Navy yard...