For 1,000 yards:
I had to go look -- I keep the Nightforce with the power selection lever at 3:00 o'clock, which is about 36X. The reason has more to do with the reticle, so I know the distance between the dot & bottom and side posts -- a personal usage.
& for what it's worth, just ordered a Sightron 10-50 x 60. I've looked through one & was impressed. We'll hope the durability holds up. Old Steel Beam Support (Rusty Stud)'s post on the F-class forum was also a factor.