Although just 1.5 inch larger than the earlier 12-inch gun it fired a shell weighing 1, 266.5 lb against the 859 lb of the earlier gun, although of lower velocity than the 12-inch 50 calibre gun the 13.5-inch 45 calibre weapon s heavier shell maintained its in-flight velocity and so had greater hitting and penetrative power, the new gun was also very accurate and possessed very good wear rates up to 450 rounds per gun, tests also showed that the gun had a very good safety margin so that the following " King George V "-class ships could fire an even heavier 1, 410 lb shell, although this lowered the wear rate to 220 rounds per gun.
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