No, not really. What I can say is the USN 5"/50 was too heavy to be a practical AA weapon. It had slow elevation and traverse, and a slow rate of fire compared to the 5"/38. The IJN may have been dealing with a similar state of affairs.
According to Campbell -
Max mount elevation 90deg; elevation @ 16deg/sec; train @ 12-16deg/sec; RoF 15-21 rpmpg.
MV 3314 ft/sec; with a fixed round 44in in length. Wow.
The IJN 3.9in was designed for all angle loading with power ramming and a loading tray. The 5in/50 used fixed angle loading, with no loading tray and was hand rammed.
Garyt wrote: Yeah Byron, the 3.9"/65 could truly compete with the US 5"/38 as far as the best DP weapon for AA purposes. It just had somewhat smaller shells, no VT fuse and Japanese fire control
A good weapon, just limited by other issues.
I don't recall making a comparison with the 5in/38 The "wow" comment was just a reaction to the 44in length of the single-loading cartridge and the very high MV of the Japanese gun.
 Service experience with the 5in/L51 had led to opinion within the IJN that the mount had been too lightly built.
 The 3.9in/L65 mount incorporated complex all-elevation power-ramming and auto fuze-setting features which the 5in/L51 lacked.
 The 3.9in/L56 mount possessed much higher training and elevation rates than the 5in/L51, which suggests incorporation of more powerful (hence heavier) power units.
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