Trying to sight in my Night Force scope. I have a 6X15X50 Night Force NXS. I start at 25 yards take a shot then move the crosshairs to the bullet hole. I'll move to 100 yards, take a shot. Shot will be off bulls eye by two or three inches. I'll make the adjustment, say elevate three inches. Bullet will jump five to six inches high on nest shot. I'll back elevation back down two to two and a half inches, and next shot is off the paper. Back to 25 yards and start over. Done this three times and still no good. Have removed and remounted scope each time. Using a torque wrench and locktite each time. Have Warne bases, and Leapold rings. Everything is tight, even checked for movement in the rings. Thinking it's time to send it back to Night Force.