Originally posted by Pyro
Why only post that picture and not a corresponding screenshot to validate your statement or at least mention some specifics? I just did a quick test firing of the Martin turret on the B-17 and it also shows a 20 foot pattern at 600 yards.

Yes I did test the gun dispersion but only on the b17’s tail gun. However, this was it was some time ago. As far as I know there's no way to change a setting that would allow the bomber guns to be fired on the ground.
I do not know if that changed in Ah2 but at the time I did my tests it was a real hassle getting everything "right" to test it.
Here's what I did:
1. From the b17 tail turret I took a screen shot of a 190d9. No zoom just standard view. The 190 flew level dead astern co alt.
2. I upped a b17 with low fuel no bombs, climbed to 1000ft and went into level auto pilot heading due south. I then set wind to 200 (IIRC) and shut off the b17 eng in an attempt to "hover". I felt this was necessary because the target flies along with the bomber maintaining 600yrds spacing. As such it would give me a false reading. The target would actual "fly into the bullet stream" and affect the dispersion pattern as the range isn’t really 600yrds. I guess I could have attempted the math but for what ever reason I tried the wind.
It was a real pain trying to get the b17 centered on the target and took many frustrating attempts. I got "close enough" for my liking and fired about 25 rounds and took an ss.
3. I then cut and pasted the 190 dead center on the target. I used this as a reference because I had no idea how far each ring of the target is spaced. (IIRC my assumption was +20 ft per ring).
I know a d9s wingspan is 34 ft. 5.5 in. and assumed the ah d9 was modeled to the correct dimensions.
The dispersion from the tail turret was within the wing span of the 190D9 at 600.
45ft > 34.5
Now I am open to the suggestion that my tests were flawed and if I have time I will reinstall Ah and try again. I will not attempt the top turret because I doubt I could get lined up right for a proper test. Unless there is some setting to allow bomber guns to fire from the ground that I do not know about. You obviously have an easier way to test it so I will take what ever find as fact to save myself the trouble or re-testing.
Unfortunately my tests were done years ago before the big week scenario and I no longer have film or a screenshot. If you say all is well and I am wrong then fine by me, I stand corrected.