Six-inch dual-purpose guns and barrel-life tradeoffs

Which was better as a dual-purpose weapon, the British QF 6-inch Mark V or the American 6-inch/47?

Neither was decisively superior: the American gun had a slight anti-aircraft edge, while the British weapon favored surface action and barrel-life requirements tied to Royal Navy logistics and doctrine.

The British QF 6-inch Mark V and American 6-inch/47 were judged closely matched, with a slight American advantage against aircraft and a slight British advantage against surface targets. British preference for shorter barrels reflected wear and the long supply route between Pacific operations and British industry. Replacing worn barrels also meant transport, stockpiles, and protected convoys, so a small ballistic gain had to justify those costs. British battle-fleet doctrine called for long-range fire to damage enemy fire control before closing to destroy the opponent. Reliability anecdotes qualify the comparison: British praise often came with the condition that the equipment worked, while American accounts expressed greater confidence.