I found a Marine WW2 1945 after action report for B-25J with the 75mm cannon mounted. Their attack profile was to approach the target at 1500ft, then diving to 1000ft before reaching 6000 yards from the target. From 1000ft 6000yds out the would fire their first round. About every 1000yds they would fire another round until 2000yds. Unless they were going to low level bomb, 2000yds was the max range for Japanese light ack.
I tested this gunsight starting at 200ft for my attack run. Then when the CV or Cruiser was at the 6000 marks, popup for the 6000yd aimpoint and fire. That would be at about 1000ft, and I would dive at the CV firing at 5500, 5000, 4000 and 3000. Only once in testing did I hit 6000, 5500, 5000, 4000 and 3000 one after the other. Usually I hit at 2 or 3 range markers on my run.
There is a readme with the zip package along with a B25 gunsight for shooting ships and a gunsight for GV and land targets. There is also a PDF of screen shots to show how to use the ship gunsight. These screen captures are just a preview. Read the PDF.
Do not unzip this directly into the game's sights folder. Each gunsight.bmp has to be copied with it's gunsight.mil file to the sights folder.
Download Link ===>> http://www22.zippyshare.com/v/17754431/file.html----------------------------------------------------------------
If you up a B25 at A16 on NDisles you can taxi to the end of the runway where a cliff falls off. That's how I was able to set the range for 6000 and the other ranges in the gunsight.
Ship Killer gunsight for the B-25H 75mm cannon.
6000 yard shot with the 75mm.
What the structures mean.
Tank Killer gunsight.