Was a US five-inch triple turret seriously considered?

Why did the US Navy study a triple 5-inch turret?

The evidence is uncertain: one contributor has found none, while another suspects a feasibility study intended to explain why the mount should not be built.

One contributor has found no evidence that the US Navy seriously considered the triple 5-inch mount in the question. Another thinks the idea came from a design study asking whether it could be built and documenting reasons against it. Even if such a study existed, it would not establish an intention to procure the weapon. Navies can use feasibility studies to explain why a proposed arrangement should be rejected.