Hit Hate Percentage is 15% our 30% is good?

Anything from 20 degrees upwards will have very little difference in shot distance
(for most guns). So try starting off with a 20 degree shot to see how far that goes.
Anything under 20 degrees can change quite a bit, especially the lower you get.

The higher angle shots, although not changing too much in distance, can be used to
alter the damage type you are doing. So where a 25 degree shot may go the same
as a 50 degree shot (these numbers are completely for this example and are most
likely incorrect), the 25 degree shot when it hits will likely hit belt armor due to the
low angle of impact. However, the 50 degree shot will take more of an arc and
possibly hit the deck armor of a ship. Keep checking the damage you do to other
ships as you fire and if you are doing low damage to belt or deck (you can tell this
based on the colour of the numbers; white = deck, green = belt) try switching
angles to alter the impact angle of your shots.

hit rate may help ur exp gain :)

Thank you all for your replies. I really appreciate it.

Well TimmyC pretty much got everything I was about to say. >__<

What I do is if I'm using 40 degree guns (I'm horrible at 45 degree, the last 5 degrees
barely make a difference between one another) is that I set my guidelines, by making my BO
lose recruits/experts, so that the guidelines at about 37 degrees on my guns. I memorize
how far 40 degrees are from the end of the guidelines (a practice shot first thing in the
battle helps) and can guestimate the angle at which anything from 40-30 should be. Once I
get below that (curse those rushing PoWs), I just remember how far 25, 20, 15, and 10 are.

It's also important to note your speed, the speed of your target, the directions both of
you are traveling in, and the orientation of your ship. All of those factors will affect
where your shells will land relative to your ship and your target.

Well, the dotted lines are fixed distances from each other, you can use them as units.
Angles in NF work more-or-less the same as in real life (i.e. the closer to 45 degrees,
the less difference in distance between angles). The exception is that NF treats your
guns as though they are at waterline level, so that 0 degrees results in 0 distance.
Another weird thing is that for some guns, 55 degrees is the max distance, rather
than 45.

So in theory, you can use a bit of math to figure it all out, but it'll be easier just to run
a test mission and note the shell's location for each angle and write on a piece of a
paper.
But even then, having to look back-and-forth between your reference sheet and your
screen will take too much time, in addition to having to count the dots on your lines.

It's better to just remember a few key points:
-the distance your max angle will hit
-the degree that will get you the end of your guide line
-the degree for half the guideline.
-angles 30, 20, and 10. Once you know those, you can interpolate the degrees
needed for distances between those.

I personally use the distance from my ship and from the end of my guidelines as
reference points for what degrees are needed.