LAST EDITED ON May-16-12 AT 05:40AM (MST)[p]Cahunter805 is dead on. I have purchased 3 custom turrets and none have yardage as its always changing. To make accurate long range hits you need to know the density altitude for your exact elevation and temp. It changes and will change and can change through the day, so if you needed 23 MOA come up at 08:00 in the morning, you may need more or less by 11:00 when it gets warmer or colder.
Make sure the elevation where you plan to hunt is close to your CDS. You may be on at 500' ASL then when you climb to 8000' and try to aim using the same dope for a 600 yard shot, you will miss. It's not the CDS's fault for the miss. Just sayin.
Reading the wind is the tricky part. Elevation is easy with today's rangefinders. The Vectronix Terrapin will give you accurate readings out to 2400 yards. Just dial in the drop and guess the wind.
The JBM drop charts are great. I use the Shooter app on my Droid for hunting. It is accurate and has allowed me to make 1st round hits out to 1500 yards. The program is only as good as the data that is input. Real world velocity numbers, density altitude, sight height, are all critical numbers. The closer to exact you are, the better the output, and the higher the percentage of 1st round hit you are.