Gun turrets for 34,3cm guns same diameter as for 30,4 cm guns according to the Dutch magazine Marineblad dated 1911-1912 no.7

An item referred to the Times which reported that the 34,3cm guns to be used on the newest British battleships and armoured cruisers [battle cruisers] had despite the larger weight almost the same diameter as the 30,5cm gun turrets.