A few years back a fellow on the bench next to me was going through box after box of expensive Weatherby rounds trying to get his new Mark V on paper. I offered to help and he turned me down. Finally, with seven rounds left he changed his mind. I took the bolt out, bore sighted it at 100 yards, took a shot, reset the rifle on the bags with the reticle on POA, then twiddled the knobs until the reticle was over the hole. The next shot was about a quarter inch away from the bull, so with a little self-satisfied grin I told him it was ready to go.
He hit the target with two out of the five shots he had left - neither hole was anywhere close to anything - grumbled at me about not knowing what I was doing, and packed up and left.
So no, I don't sight in rifles for people anymore.