Thought I'd chime in to help. There are 3 ways to shoot accurately at long range.
1. Have a custom turret made for your caliber and ballistic load. This is ultimately the most accurate. We use Kenton as a partner.
2. Use Rapid-Z or something similar in conjunction with our on line calculator. The calculator matches the ballistics with the ideal magnification setting. (sub tensions change at different magnifications, so our calculator will tell you, for example, to have your scope set at a specific power for matched ballistic performance). This system is also extremely accurate and you can use the same scope for many calibers
3. Use a "estimation" ballistic system. Generally offered by most optics companies and it gets you close, but not nearly as accurate.
There is a 4th also, buy target turret scope and sight your rifle in at all distances
Probably some others I have missed, but this covers the most popular options.
