The US considered using 18" guns on the Montana class - but decided to stick with the 16" 50 caliber guns used on the Iowa class. They didn't gain much in range or accuracy with the 18" gun (that they designed) and the broadside weight with only 8 18" guns (4 turrents of 2 guns) was lighter than the broadside weight of 12 16" guns (4 turrents of 3 guns).
Since they knew this they must have built one or two 18" guns for testing.
The Japanese battleships with 18" guns had a slight range advantage over the 16 50s of the Iowa class - but they couldn't utilize the extra range because they had no means for optical aiming over the horizon - the Iowa class could aim using their radar that was mounted on the highest point of the ship making shots over the horizon possible.
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Today's Featured Article - Women and Tractors - More Views From the Farmer's Wife - by Teri Burkholder. The top ten reasons why the judges wouldn't let you participate in the stock antique tractor pull: Hey, this is stock! It came with that V8 in it! That "R" on my tires stands for "really old" not radial! Blue gas? We thought it was a pretty color! What wire hooked to my throttle?
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