Some of you may know that the scope png. is 800x600 and therefore there is no exact middle pixel. This creates some trouble when you want an accurate scope as you know..
I cam up with this prefect solution! This is very poorly drawn, the only thing that matters is the middle aimingstick thing itself:

Just aim with the top of that stick and you'll do fine! It works like a charm! :D
Here is a download link just in case: http://www.mediafire.com/?fac54j55cze3oab