How a 32-pounder maps onto a modern six-inch gun

What World War I weapon is the closest equivalent to an Age of Sail 32-pounder cannon?

Roughly a six-inch gun, once the different shapes and weights of round shot and modern shells are taken into account.

A 32-pounder's round shot and a modern six-inch shell should be compared by both bore and projectile form. The older bore is described as roughly 6.3 to 6.4 inches, but a modern shell is longer than a spherical cannonball and has a different weight. Six-inch naval guns are therefore offered as the closest calibre category in the World War I period. The same comparison places the 24-pounder near 130 mm, with French destroyer armament used as an example of continuity in preferred gun sizes. These are approximate equivalents between weapon eras, rather than claims that their ammunition or performance is interchangeable.