Long Range Shooting Simulation.
 

This nifty program may cost you some, but I've found it an invaluable tool to teach me the basics of external ballistics, as well as proper scope use. Perfect for snipers.

Home Website - http://www.shooterready.com

EDIT: Please don't take this as advertising. I am speaking here on my own, from over 1 month's experience.

tried the demo, lol I have no fucking clue what I'm doing in there, hit the first target on the third shot though :P lol still can't get the second guy though

EDIT: just completed the Demo, total score was 77, what did you get?

Demo here: http://www.shooterready.com/moademo.html

Too lazy to go through that pain again. My scores vary A LOT (sometimes, I just give up quarter-way), and I never took the liberty of keeping records, lol. My highest was somewhere around 70.

I can give you the following hints:

1. Distance between two dots on the scope is 1 milliradian.

2. 1 Mil (Milliradian) at 1000 yards = 1 yard. (same with the metric system.)

3. 1 Mil = ~3.5 MOA (Minutes of angle)

4. Formula for figuring out the distance to the target is

Size (yards) x 1000
-------------------- = range (yards)
Size in mil

5. Wind speed at 1.5, 4.5, 7.5 and 10.5 o'clock is a half-value wind. (will have some properties of head/tail winds)

6. Head wind and tail wind is a factor: Head wind causes you to hit low, tail wind causes you to hit high.

7. Formula for converting inches of wind drift to MOA is

Wind drift (inches)
----------------- = MOA wind adjustment
Range (yards)/100

8. Adjust wind MOA to the direction it is blowing.

I've used the demo off and on for the past few years, posted it here before too, always good to repost something like this. It gets harder as the range and caliber goes up, especially range calculations. Very useful tool though.

I'd like to point out that it's possible to cheat by clicking at the spot where the round hits and dragging that onto the target. However, you'll just be cheating yourself in the end.
Anyways, I got a total score of 91 without the above. :)