History
Mk X continued the trend of lengthening gun barrels as far as new construction methods would permit, in order to allow more cordite propellant to be used to attain higher projectile velocities. Mk X increased the bore length from Mk IX's 480 inches (40 calibres) to 540 inches (45 calibres), increasing muzzle velocity from 2,600 to 2,700 feet/second.
Subsequent British attempts to further increase the power of 12-inch guns led to failure with the 50-calibre Mk XI and Mk XII guns; the Mk X was the last successful 12-inch British gun.
Read more about this topic: BL 12 Inch Mk X Naval Gun
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