This is my experience with the lvl 20 3'' twin.
- 24', they hit the planes at standard hight just before the shells explode (max range) from there on you increase the angle depending how far the planes are away.
For example, planes that are about half way from your ship to where the shells explode I usually use 27-28 degrees.
With the lower angle AA guns you do need to do alot of adjustment, I think it is the same with all long range, low angle AA guns (all nations), generally you do not use them for bombers coming for you, rather for sniping down scouts that your BB's cannot reach.
just my 1 cent :)
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