Cruiser guns

In the Southwest Pacific in 1942 and 1943, the Americans found that he 8in/55 gun had too slow a rate of fire while the 6in/47 gun was outranged by the "Long Lance" torpedo. The 6in/47 gun could fire 10 rounds per minute, and the Brooklyn class had 15 of them. They could fire so rapidly that you could see a stream of shells heading for the target.The US might well have benefitted from a 175mm gun with a 176 lb. shot. The US was building 175mm guns for the Army, so it was a known caliber, although not in the Navy. Concievably, they could have built a new gun with a 16cm or 16.5cm caliber.