WesWorld

The closest thing to a full-auto 6" would be either the US 6" Mk16DP (which was designed in 1943 and came into service in 1948 and was VERY heavy and somewhat problematic), or the Swedish 15cm or 15.2 cm M1942, which came into service in 1947 (this one I lack a source for weight). These guns (the Dutch 15cm version) are still in service on the Peruvian navy's BAP Almirante Grau, so I'd guess they proved less troublesome than the Mk16DP. But that's only a guess.

Duly noted. However, that won't keep me from trying.

Quoted

Originally posted by Red Admiral
Could go for automatic 152mm guns, but they're just heavier and more complex. You can kill just about anything with this anyway.

The problem is more one of logistics than simple hitting power. The 152mm is Brazil's standard 5-6" weapon and is either on or planned for a lot of ships.

Assuming there's time, Germany might well be looking at the 15cm M1942-type design in the 40s for light cruisers and as a secondary armament on battleships (assuming there are any built in that period, of course). In Germany's case, it would be driven by the desire to keep hitting power vs destroyers and light cruisers high when going away from dedicated secondary and AAA batteries on capital ships, and to allow the CLs to use their main battery against aircraft (which would allow the secondary battery to be lightened, probably).

Well, there is the fact that reportedly that rapid-fire 6" guns on late-war US cruisers turned out to be excellent weapons for use against light ships. In fact, they did a better job of escorting carriers than the 8" cruisers did. Go figure.

Don't forget that the date on RA's design is 1940, rather later than the rest of the crop.

Note again that the airplane, while impressive, has not yet proven itself over the warship to the level of the Second World War. The primary threat from the air at this time is a single Japanese colonel with a need to land into anything he sees.

In the next five years we'll see if that changes, but if there are no conflicts that show the need for such batteries, they probably won't be developed.

Well, good job everyone. No matter who's design I go with, or if I go with one of my own, I sincerely appreciate the effort and skill put into these designs.