The gun is a 20''.
So? The 28 cm/52 (11") SK C/28 used on the Lützow weighed 600mt, the 38 cm/52 (14.96") SK C/34 used on the Bismarck weighed 1052 and the 40.6 cm/52 (16") SK C/34 intended for the H39(?) weighed 1,475 mt.
Throw that at your calculator and can guestimate the weight of a 20" turret. About 2716mt in case you're wondering.
Compare that to the 782mt BL 15" Mk 1 used on the Erebus class.
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