The rockets are only effective out to 2750 range on the target! no matter how much more you raise the gun 2750 is as far as they will go
I set up offline with a target and shot from 500 all the way to 3000 only hitting the 3000 one time firing over 600 rockets!
I also now have a scale to use to hit targets from 500 to 2750 without any problem.
while i like to use f-8 for this, it is not necessary with the gun pushed up but not zoomed in,, the bottom of the barrel on my screen is still farther than I can hit
this is very simple to do, go off line get the tank out point it north click .target 500 and go to work it took some time to find a base with flat ground extending 3000 out to the north but there are some!
next I went to the south side of town, put up the target then moved away from town till the target was in the building i wanted to hit, after ranging it I moved out another 500 till i got to 2750.
at 2750, if you keep raising the gun, the rockets start falling back at you based on trajectory.
this all took about 2 hours, I marked a piece of paper with the markers and have it on a sticky pad as well, now when i get to town i just put the sticky note up and fire away, you can also now rotate with f-8.
after firing just zoom in as soon as you fire and you can follow the rocket right to target, this is tough the first time or two but once you see it a few times it will become easy!