Could a six-inch gun serve in anti-aircraft fire?

Could a six-inch gun load and train quickly enough to be an effective anti-aircraft barrage weapon?

The Royal Navy believed its late-war high-angle six-inch mounting could do so, and planned new cruisers around that capability.

This was explicitly the Royal Navy's late-war intention. The mounting's loading and training performance was central to Cunningham's preference for a new six-inch cruiser over a 5.25-inch alternative. The claim concerns barrage and dual-purpose potential rather than precision fighter interception by a conventional cruiser gun.