BBV) Bonuses

Battleships receive accuracy bonuses if the guns are fit and penalties if it is overweight^[1].

Large Caliber Main Guns Groups
Gun Groups	Guns
Sov 30.5 cm ^[2]	Sov 30.5cm Triple Sov 30.5cm Triple K
RM 30.5-32 cm ^[2]	RM 305mm/46 Twin RM 305mm/46 Triple RM 320mm/44 Twin RM 320mm/44 Triple
35.6 cm	IJN 35.6cm Twin IJN 35.6cm Twin Dazzle IJN 35.6cm Twin K IJN 35.6cm Twin K2 IJN 35.6cm Triple Proto IJN 35.6cm Triple Dazzle KMS 38cm Twin KMS 38cm Twin K RN 38.1cm Twin ^[2] RN 38.1cm Twin K ^[2]
FR 38 cm	FR 38cm Quad FR 38cm Quad K FR 38cm Quad K2
RM 381 mm	RM 381mm/50 Triple RM 381mm/50 Triple K
41 cm	IJN 41cm Twin IJN 41cm Twin K2 IJN 41cm Triple Proto IJN 41cm Triple K IJN 41cm Triple K2 RN 16" Triple RN 16" Triple + AFCT RN 16" Triple + FCR USN 16" MkI Twin USN 16" MkV Twin USN 16" MkVIII Twin USN 16" Triple Mk6 USN 16" Triple Mk6 + GFCS USN 16" Triple Mk6 M2
USN 16" Mk7	USN 16" Triple Mk7 USN 16" Triple Mk7 + GFCS
46 cm Twin Proto	IJN 46cm Twin Proto
46 Triple cm	IJN 46cm Triple
46 cm Triple K ^[2]	IJN 46cm Triple K
51 cm	IJN 51cm Twin Proto IJN 51cm Twin IJN 51cm Triple Proto
15.5 cm Sec	IJN 15.5cm Triple Sec IJN 15.5cm Triple Sec K IJN 15.5cm Triple Sec K2

↑ https://twitter.com/KanColle_STAFF/status/493648336142876674
↑ ^2.0 ^2.1 ^2.2 ^2.3 ^2.4 There is not enough data yet to determine exact category of those guns.

↑ ^1.00 ^1.01 ^1.02 ^1.03 ^1.04 ^1.05 ^1.06 ^1.07 ^1.08 ^1.09 ^1.10 ^1.11 ^1.12 ^1.13 ^1.14 ^1.15 ^1.16 ^1.17 ^1.18 ^1.19 ^1.20 ^1.21 ^1.22 ^1.23 ^1.24 ^1.25 ^1.26 A multiplier of 0.6x is applied when married.
↑ ^2.0 ^2.1 A multiplier greater than 0.6x is applied when married.
↑ ^3.0 ^3.1 For BB only: if the base maximum HP (unmodified & before marriage) is > 92, set fit bonuses are set to 0.
↑ In addition to other base type bonuses.
↑ Yamato Kai Ni Juu specified bonuses override the base BBV bonuses.
↑ In this case, the "46 cm Triple", "46 cm Triple K", and "51 cm" groups are counted as one.

The table shows an estimated accuracy fit bonus based on having one fit gun equipped.
For married ships, the overweight penalty is generally reduced by 40%:
- E.g. a married Kongou with a 46cm receives -6 instead of -10,
- Some exceptions will receive a bonus instead of a penalty on certain guns after marriage.
If more than one gun of the same class is used, multiply the modifier by the square root of the number of guns:
- E.g. a Kongou with two IJN 35.6cm equipped receives √2 x 7 = 9.89.
If guns from different classes are used together, add the modifiers together.
- E.g. a Kongou with 35.6cm and 41cm mixed receives 7 - 5 = 2.
- Exceptions arise where different guns of the same class give different bonuses on certain ships, notably Gangut, with what happens when combining 30.5cm and 35.6cm is still under investigation.

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]

With:

[math]\displaystyle{ W }[/math] the resulting fit bonus or overweight penalty
[math]\displaystyle{ C_{k} }[/math] 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] 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] the number of equipped guns for that gun class.

Sources: [1] [2]

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