I have mounted the 2.5-10 x 50 zeiss varipoint scope that I used to have on an r93, to a sauer 202. Both were the same calibre (270). However, on initial firing, the bullets landed about 2 feet low at 100 yards. I was not expecting this at all, and as a result, have had to turn the vertical adjustment turret to nearly it's maximum hight setting. Any idea what would cause this significant variance from rifle to rifle?