Raw Data...
Some interesting history here. I'll post the link to where I got it all.
Here is the link:
http://navweaps.com/Weapons/WNJAP_Main.htm
Gun data...
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20 cm/50 (8") 3rd Year Type No. 2
Rate Of Fire 3 to 4 rounds per minute
maximum of 3 rounds per minute at +55 degrees and 2 rounds per minute at +70 degrees.
Projectile Types and Weights
Common Type 3 IS - 277.4 lbs. (125.85 kg)
Bursting Charge Common Type 0 HE - 18.0 lbs. (8.2 kg)
Muzzle Velocity All except Illum - 2,756 fps (840 mps)
Ammunition stowage per gun 120 - 126 rounds
AA Ceiling @ 50-55 degrees 32,820 feet (10,000 m)
Mount / Turret Data. Designation Two-gun Mountings Aoba (3), Furutaka (3)
Elevation
Aoba Modified C: -5 / +50 degrees
Furutaka Modified E2: -5 / +55 degrees
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12 cm/45 (4.7") 10th Year Type
Rate Of Fire 10 - 11 rounds per minute maximum
6 - 8 rounds per minute effective
Projectile Types and Weights
(see Note 1) Common Type 0 HE - 44.9 lbs. (20.3 kg)
Bursting Charge Common Type 0 HE - 3.75 lbs. (1.7 kg)
Muzzle Velocity Common HE - 2,707 to 2,723 fps (825 to 830 mps)
Ammunition stowage per gun 200 - 250 rounds
AA Ceiling @ 75 degrees 32,800 feet (10,000 m)
Mount / Turret Data.
Designation Single Mounts Aoba (4),Furutaka (4)
Elevation -10 / +75 degrees
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25 mm/60 (1") Type 96 Model 1
Rate Of Fire Cyclic: 220 - 260 rounds per minute
Effective: 110 - 120 rounds per minute
Weight of Complete Round All types about 1.5 lbs. (0.68 kg)
Muzzle Velocity 2,953 fps (900 mps)
Ammunition stowage per gun 2,000 rounds
Normal allocation was one tracer in every five rounds.
AA Ceiling @ 85 degrees Effective: 9,843 feet (3,000 m)
Elevation -10 / +85 degrees