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I understand that the reason the Bismarck and Tirpitz had 15" guns rather than 16" as Hitler would have preferred, was that there was a desire to upgun the Scharnhorsts with 15" guns, they couldn't mount 16" as the turret ring diameter was too small, and they were unable to develop two mountings at once as there wasn't the capacity in the industry. Presumably, this same lack of capacity would have made it difficult to develop a triple 12" turret quickly, and since the 11" armament on the Scharnhorsts was temporary why bother?
Also there is the logistical problem of using four different large caliber guns in what would have still been a quite small fleet, better to stick with 11" for the panzerschiffs (and presumably 3 more to be built with the turrets removed from the Scharnhorsts), 15" for the Bismarcks, Scharnhorsts and P class battlecruisers, and 16" for the H class.
Graf Spee types, it is clear the scale of armor was "battleship". Often cited as a shortcoming, are the 11" main armament. Germany developed a very good 12" gun for WW1. Anyone have a citation as to why was IT not chosen for the Scharnhorst class? Design time for a new turret or what?
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