What scope make and model?? I am assuming you are wondering how to recenter the windage adjustment. To do that, you have to know how many clicks it has in the adjustments. If, as you say, you have fully ran it out to the left, then if you know how many clicks of adjustment is has, divide that number in half and run it back to that number to the right. You should then be at center value. Do the same with elevation as well. As far as your problem getting it on paper with that particular rifle, it could be any number of things. The holes in the receiver could be off. The scope base holes could be off. The scope base itself could have a slight runout. The base of one of your rings could be off making them misaligned. I have an alignment tool that I use when I mount bases and rings. Lets me know beforehand if I will need to shim or lap the rings. Seen a lot of scopes damaged from misaligned rings.