Did six-inch gun performance vary by navy?

Was six-inch gun performance very different among navies?

Yes; mounts, handling, and practice produced different rates and consistency, with British and American systems generally stronger in the comparison offered here.

Nominal six-inch calibre concealed meaningful differences in mounts, ammunition handling, crew practice, and achievable fire. British and American systems are described as generally producing stronger sustained fire than Japanese or German counterparts. Italian cruisers could range from extremely aggressive output to inconsistent performance. Gun count and calibre are therefore incomplete measures of a cruiser's fighting value.