Re: 1000 yard optics
Depending on your load,you are going to need 35 to 45 min of elevation to go from 100 to 1000yds. If you shim your bases and use rings like the Burris Sig w/inserts, you should be able to get the job done with the scope you have. If you haven't looked at them, consider the Leupold factory target turrents. They can be added for little money and work very well.
Other scopes to consider are the new Elite 3200 10X, the Tasco SS 10X42 if budget is limited (still very good scopes, own both). If you have more money, consider the IOR, Elite 4200, and VariX 3X9 Leupold Tactical.
If you have lots of money, consider the 16X LR Leupold, Nightforce and others. Not sure if you will get better scopes but they will be more money.