that if he moved his windage, his elevation adjustment would change as well and vice versa.
My guess is he did not have his scope perfectly level to his rifle . This will make you cant your rifle . I know this cus I had all my scopes canted and had to reinstall them with the http://www.amazon.com/gp/product/B00...ls_o00_s00_i00
And now they all track great and I shoot better .
Or he just canted his rifle when he shoots . This will also make your bullets track at an angle . I had/have that issue as well . I was shooting all my rifles to the right no matter what the rifle or sights . A quick Q & A on TFL here helped me out a great deal .