How navies tested guns, shells, and armour

What metrics were used to test naval weapons?

Testing examined whether a weapon penetrated a given armor target, the damage it produced, and the range at which it could do so, with targets made progressively harder.

At its most direct, the test asks whether a weapon can make a hole in a specified thickness of armour and at what distance. Increasing the density and thickness of test targets reveals the limits of a shell or gun. Greater discretionary funding under the Third Sea Lord could have supported a denser programme of ammunition, shell, and armour trials in the early twentieth century. Such experiments mattered because their results fed back into ordnance, protection, and ship-design decisions.