Why six-inch guns do not suit a Tribal hull

Would a six-inch gun work on a Tribal-class destroyer hull?

No. The Royal Navy examined heavier fits but judged the Tribal hull insufficiently stable for accurate six-inch fire.

The Royal Navy considered different gun fits for the Tribal class but judged six-inch weapons unsuitable for accurate fire from that hull. A heavy shell has limited value when the platform cannot deliver consistent hits. The German choice of 5.9-inch guns illustrates the attraction of maximum hitting power and the difficulty of exploiting it from a destroyer. In the proposed British cruiser, 4.7-inch guns sacrifice some range but should benefit from a platform steadier than the destroyers for which they were developed. Royal Navy studies also considered 5.25-inch fits, but those remained designs rather than proceeding further.