Could the US Navy save money by reusing guns and turrets from older standard battleships in new battlecruisers?
Short answerPossibly, if it chose to build battlecruisers, but concentrating on fast battleships would avoid paying for both types.
NotesReusing old main batteries is conditional on building a separate battlecruiser line. Concentrating on fast battleships offers another way to contain costs. In this scenario the choice of ship types comes before the question of reusing their armament.