I have a leupold vari-x-III 6.5-20X40 that im trying to mount on a rem 700 7mmrum. How can I tell if the scope is square on the receiver? I put the windage to mechanical 0 and mounted the scope and now need almost 22 minutes right to zero on bore sighter. If Im able to bore sight with the scope in mechanical zero will this mean that its square ( not sure if thats the term)? and, how do I fix this?