If you can't hit 1K with 60 MOA, you need to change calibers. LOL
For example.....With my 7mm RemMag, and my current load for 160gr Accubonds, if I am zero'd at 100 yards, I would have to dial up only 28.2 MOA for 1,000 yards, and 3.6 MOA for wind drift w/ a 5mph cross-wind.
The Zeiss 6.5-20x50 will more than do that, however, it comes with a Miliradian reticle (Mil-Dot). So with a 100 yard zero, you will need to achieve 8.2 Mils of elevation, and 1.0 Mils for wind drift w/ 5mph cross wind.
What I would do it I were you would be to buy the Zeiss 6.5-20x50, with a 20 MOA base. That way you KNOW you are going to be able to reach on out there.