[U S Army EOD]

I think the Montana class was to have 18" guns or larger. She and her sisters were designed to counter the Japanese super battleships.

[Rustys]

The Proposed Montana class would have had 12 16"/50 cal guns in 4 triple turrets, basically the same armament as the Iowa's with one more turret added. The secondary battery was the same as the Iowa's at 20 5"(I believe they were 54 cal) guns in twin mounts.The 16"/50 cal was an excellent gun, and with it's well designed 2,700 ap round was actually considered the equal of the Yamato's 18.1", 3,lbs shell. The U.S. gun also had a much faster rate of fire.
Because of there increased Armour protection and the extra turret, they would have been too wide for the Panama canal and had a displacement slightly greater than the Yamato class.( The U.S. tended to understate the tonnage of it's BB's. The Iowa's were listed at 45,000 tons. they usually operated at a displacement 10-15,000 tons or more above that.)