ORIGINAL: Capt. Harlock
The fights occurred at very close range. Those 8" shells were NASTY!
The Minneapolis and most of the Astoria class were armed with the first "super-capacity" guns of the USN. The shell weight was about 335 lbs, whereas a typical 8-inch shell weighed 260 lbs before. (I'm not sure if WitP AE simulates that.)
Do you mean these:
From navweapons
Other than the Des Moines (CA-134) class, AP Mark 21 (super heavy) was apparently issued only to the Baltimore (CA-68) and Oregon City (CA-122) classes. SP Common had a thin cap and a windscreen. HC Mark 25 was designed such that it could be forged from the base end.
Check the database you will find that Allied AA and SF guns both are rated better then IJN ones. But a later 8inch gun has even better stats so guess it is in the game. Also Allies get a boost somewhere in 43(?) for radars and VT-fuzed projectiles , see also:
https://www.smecc.org/radio_proximity_fuzes.htm
But the best IJ gun is sadly underrated in the game (10cm DP)[:@]