The implications of gun-barrel length cannot be separated from the metallurgy available at the time. What counts as a short or long barrel changes as materials and construction improve. A table of dimensions also misses why each navy accepted particular performance tradeoffs. Italian and Swedish 127 mm destroyer guns can share a nominal caliber while reflecting different requirements. A useful comparison asks what the designer wanted the gun to do and what costs the navy accepted rather than simply identifying the longer barrel.
Notable Point · 2:29:33-2:30:50
Gun-barrel length depends on metallurgy and design priorities
Barrel length cannot be compared cleanly across eras or navies because metallurgy changes what is practical and equal calibers can serve different design priorities.