User blog comment:Hayashi H/Yasen CA Medium Gun Test/@comment-26486243-20160309141053

This link was mentioned by Qunow in chat.

http://ux.getuploader.com/kanokiba/download/123/3gox2_2gox2YasenRengeki.xlsx

Test design:
 * Mikuma lvl 99, dual No.3 + dual T22 SR.
 * Mogami lvl 99, dual No.2 + dual T13 ARK.

Double attacks are recorded, and hitrates measured, with morale above 33 and below 50.

Results were:
 * Mikuma 91.1±4.0%
 * Mogami 69.8±6.3%.

These numbers are insufficient for quantifying differences, but sufficient to qualify that the difference exists. Author posited this as proof that No.2 guns does not have a bonus.

Meanwhile, the above tests between No.2 and 14cm guns are indicating that No.2 has an increased accuracy not explainable by any other factor except yasen bonus since they have identical accuracy and identical builds aside from the one gun. More sample size needed.

Current possible explanations:
 * The base accuracy of Mikuma is higher than Mogami.
 * Surface radars improve accuracy over and above their accuracy bonus. That is, for some reason, they may modify the Night Double Attack to a more accurate variety.