It appears that the US Navy has tested, last summer, new ammunition for its existing weapons on destroyers and cruisers. This new type of ammunition is called the Hyper Velocity Projectile (HVP) and can reach speeds up to Mach 3. Read full news at this link...
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| HVP 5-inch to be fired from Mk 45 at Surface Navy Association 2017 in the USA (Picture source : Navy Recognition) |