Firstly, do the search on- Aiming In Ostwind: An End to Vulching as a Viable Method of Score Padding
by Zazen13
Secondly, my Ostwind shooting tip is this:
1. Bring up your gunsight to full zoom
2. Place your mouse pointer tip in the center of the gunsight. Be careful not to move or bump your mouse as this will move the pointer.
3. Press the "page up" button on your keyboard to raise your line of sight for better visibility. Be aware if you move your view it will revert back to the default position(lower).
4. Shoot a few practice shots on a distant object to see where they land in relation to your pointer tip placement and make any little adjustments necessary to center your aim.
5. Keep in mind an Ostwind firing pattern in rather erratic and tends to have a spray pattern at best.
6. What you are really doing is simply placing your mouse pointer in the middle of your screen,the aiming point for ALL guns in AH2.
Some even put a piece of clear tape or something on the screen to mark this point.
This method has helped improve my kills with improved visibility to see incoming enemy. Of course you'll still have to practice leading your target which has many variables and just takes practice judging distance and speed of the bad guys.
One last thing Alky, you might think about posting in Help and Training on a question like this in the future. Hope this helps and good luck to you!