How big is that gun, anyway?
I don't suppose there's any chance it could be 155mm and use the same wide range of ammunition types that all the NATO armies have available? And all the R&D paid for by someone else, too.
I seem to remember that the USN were at least thinking along those lines for the DDX.
And, don't get me started on a 10,000 ton "destroyer".
It should be an Anti-Air Cruiser at that size