Angle Cosine Indicator
I've used Ward's Angle Cosine Indicators for 3 years now, own his C-Level and have also taken his long range shooting class in 2007. The Cosine Indicator, when combined with a ballistic program, such as Exbal Software, is an invaluable tool for consistently hitting targets on up or down angles, even at extreme ranges. Once a shooter learns how to use this system, it is extremely precise and with some practice, you'll be amazed at how successful you'll be at hitting long range targets, under any situation. If you are new to long range shooting or want to learn a few more tips, I'd recommend taking Ward's Personalized shooting school and using the Angle Cosine Indicator. It is money well spent.