To 1000yds, you are going to need 20 to 35 min when using a BC bullet of .4 or higher with a muzzle vel. of 2700fps or higher. Basically, you will have no problem getting that far. The only one is the 220swift.
If you use varmint weight bullets, they are going to drop like stones. If you use the 69 to 75gr bullets, no problem.
With 86min, I can take my 308 shooting 155gr amax bullets to 1500yds. With 75min, my 300Wby shooting the same bullet can go to 1960yds.
If you can use the full 90min, you are going a very long ways with any decent bullet. Chances are you are going to need to shim your bases and use Burris sig. rings to make that happen.