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Large Caliber Main Guns

Battleships receive accuracy bonuses if the guns are fit and accuracy penalties if its overweight[1]. How much bonus/penalty a ship receives, depends on the battleship class, the caliber and type of the gun, and whether the battle takes place during day or night.

Ship Class (PPrototype 35.6cm Triple Gun Mount)35.6cm35.6cm Twin Gun Mount(DC35.6cm Twin Gun Mount (Dazzle Camouflage)),
38cm38cm Twin Gun Mount(K38cm Twin Gun Mount Kai),
30.5cm30.5cm Triple Gun Mount(K30.5cm Triple Gun Mount Kai),
38.1cm38.1cm Mk.I Twin Gun Mount (/N38.1cm Mk.I/N Twin Gun Mount Kai)
38cmQ38cm Quadruple Gun Mount,
38cmQK38cm Quadruple Gun Mount Kai
381mm381mm/50 Triple Gun Mount,
381mmK381mm/50 Triple Gun Mount Kai
41cm 16inch (United States Navy) 16inch (Royal Navy) 46cm P51cmPrototype 51cm Twin Gun Mount,
51cm51cm Twin Gun Mount
51cm TriplePrototype 51cm Triple Gun Mount
41cm41cm Twin Gun Mount,
ProtoPrototype 41cm Triple Gun Mount,
Kai41cm Triple Gun Mount Kai
3K241cm Triple Gun Mount Kai Ni 2K241cm Twin Gun Mount Kai Ni Mk.716inch Triple Gun Mount Mk.7 Mk.7
+GFCS
16inch Triple Gun Mount Mk.7 + GFCS
Mk.6
mod.2
16inch Triple Gun Mount Mk.6 mod.2
Mk.I16inch Mk.I Triple Gun Mount +AFCT16inch Mk.I Triple Gun Mount + AFCT Kai Kai
+FCR
16inch Mk.I Triple Gun Mount Kai + FCR Type 284
ProtoPrototype 46cm Twin Gun Mount 46cm46cm Triple Gun Mount Kai46cm Triple Gun Mount Kai
GangutGangut +7
30.5cm: +10
0 +1 -7 -3 -9~10? ?? ?? -7 -18 ?? N/A
Kongou-classKongou
Hiei
Kirishima
Haruna
+7 0 -2 -5 -5? -5 -6~7? -5 -6 -3 -7 -10 -10?
BismarckBismarck
Vittorio Veneto-classLittorio
Roma
+4 0? +1 -5 -5 -4? -5 ?? ?? -7 -10 ??
IowaIowa +4? 0? -2? -5 0 +2 -7 -10 ??
South DakotaSouth Dakota -5
M: +4.6
RichelieuRichelieu +4 +4~5 -2 -5 -5 -7 -14? -8 -7 -10 ??
WarspiteWarspite +6
38.1cm: +8
+1~2 +2 -2? +5 ?? +3~4 -8 -11 ??
NelsonNelson 0 0 +3? 0 0
Ise-class Kai/Fusou-class Kai/NiIse Kai
Hyuuga Kai
Fusou Kai
Fusou Kai Ni
Yamashiro Kai
Yamashiro Kai Ni
+4 0 +2 +2 0 0? -3 -7
F+: -11?
-4?
Ise-class Kai NiIse Kai Ni
Hyuuga Kai Ni
+4? 0? +4? +4? +6 +2 ?? -7
F+: -11?
??
Ise/Fusou-classes BaseIse
Hyuuga
Fusou
Yamashiro
+2 0? +2 +2 +2 +2? +3 -3 -7 ??
Nagato-classNagato
Mutsu
0 ??
Nagato-class Kai NiNagato Kai Ni
Mutsu Kai Ni
+2? 0? +2? +5 +5 +5~6 0 +4 -2? -4? -6? Nagato: -5
Mutsu: -8
??
Yamato-classYamato
Musashi
0 +3 +3 +7 0 ??
Yamato Kai NiYamato Kai Ni[2] (FBB) 0 ?? -7 ?? ?? -10
Note: Fit gun mechanics are still being investigated to this day, hence the values are not final and may be subject to changes. Values with a question mark either mean that it is not conclusive yet or the conclusion drawn here is not the same as the one drawn by Yumeji.
  • The table shows an estimated accuracy fit bonus based on having one fit gun equipped.
  • For married ships, the overweight penalty is reduced by 40% (A married Kongou with a 46cm receives a penalty of -6 instead of -10, for example).
  • If more than one gun of the same class is used, multiply the modifier by the square root of number of guns. (A Kongou-class with two A class guns equipped for example, that's √2 x 7 = 9.89)
  • If guns from different classes are used together, add the modifiers together. (A Kongou with a 35.6cm and 41cm mixed for example, that's 7 - 5 = 2.
  • Exceptions arise where different guns of the same class give different bonuses on certain ships, notably Gangut. What would happen if you combine 30.5cm and 35.6cm is still under investigation.
  • The information in this table is sourced from this spreadsheet maintained by Dewy with the relevant sources linked in the spreadsheet.
Last Updated: Aug 24th 2020 Made by: Tsubakura

More generally, the accuracy offset can be defined with the formula:

[math]\displaystyle{ W = \sum^{\text{All Classes}} \left ( C_{k} M_{k} \sqrt{N_{k}} \right ) \% }[/math]

Where:

  • [math]\displaystyle{ W }[/math] is the resulting fit bonus or overweight penalty
  • [math]\displaystyle{ C_{k} }[/math] is the main coefficient of the equipped gun class. Refer to the above table for the coefficients applied to each Battleship for their respective guns.
  • [math]\displaystyle{ M_{k} }[/math] is the marriage coefficient for the particular gun class. Assumes a value of 0.6 if the ship is married, and if the main coefficient is negative.
  • [math]\displaystyle{ N_{k} }[/math] is the number of equipped guns for that gun class.


https://docs.google.com/spreadsheets/d/1tN3X92q9zaWC0IMHfgw-dSqWnuscgKJT7ZOf9M9_Hjk/edit#gid=0