To pick a few nits:
The Army mounts howitzers and mortars currently. The Navy mounts guns.
Current Navy guns are automated and fire ~ 16-20 Rounds / minute. The Army howitzers max out at ~1 per minute.
The Zumwalt will mount 2 155mm (6 inch) guns. Rate of fire 10 rounds per minute, Effective firing range ~100 miles miles with Long Range Land Attack Projectile (LRLAP)
Good info. Did not know that the Zs were to mount 155 s.
I saw the last of the 8 inch cruisers mothballed at the Philadelphia Naval Yard. They had fixed ammo semi- auto guns IIRC and could shoot pretty fast theoretically.
Saw Iowa and Wisconsin there also.