Solutions
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Gs11's post in Ranger Passive Accuracy class bonus was marked as the answerHmm now I understand why nobody reports similar effect, I was convinced that +15 accuracy for ranger is most appropriate, becouse of http://pillarsofeternity.gamepedia.com/, though I'm aware is somekind outdated, but thought that it was intended effect.
Their base ranged accuracy is +15 above their base melee accuracy.
thx for info, I need to repair my ranger, in this situation not intended +15 accuracy bonus is kind of cheating ;p