It is most effective against cruisers, but lacks the penetration to get through battleship belt armour. The CPC is a semi-armour piercing round, combining a respectable amount of penetration with a significantly larger explosive filler (~58 kg TNT equivalent) than the APC ammunition. They are most effective against heavier armour, such as on battleships or armoured cruisers. The APC Mark Ia has a larger explosive filler (~22 kg TNT equivalent) but less penetration, while the later APC Mark IIIa trades a smaller explosive filler (~16.5 kg TNT equivalent) for more penetration. It is capable of inflicting devastating damage against lightly armoured targets such as destroyers and some light cruisers. The HE shell has a massive explosive filler of ~88 kg of TNT equivalent. The main guns have a choice of four shells: HE, APC Mark Ia, CPC, and APC Mark IIIa. Unlike the preceding Dreadnought, the Marlborough has a modern director fire control system that is considerably more accurate and computes firing solutions faster. All turrets have +/-150 degrees of traverse, although the amidships turret has somewhat more restricted firing arcs because of the superstructure. They have a maximum rate of fire of 2 rounds/minute with an ace crew. All are located in the centreline, allowing all main guns to be used in a broadside. Four of these located in the bow and stern, two each, while the fifth turret is located amidships. The Marlborough is armed with ten BL 13.5-inch Mark V (H) guns distributed in five twin turrets.
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