Zero your rifle at 100 yards. Develop your "Come Up" sheet for yardage futher than that.
Correct your elevation and wind deflection info from a ballistic program data as reguired. I find that most ballistic programs are fairly dead on till about 400 yards. After that you will find that corrections to what the ballisitc program states for elevation and wind deflection will usually be required. Keep notes.
Most tactical shooting practice sessions and matches out to 1000 yards will perfer you start with a 100 yard zero, especially if they are creating your come up sheet with their ballistic program.
You will likely need a 20 MOA canted mount to get out to 1000 yards. | 
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