Ok,
Nobody makes a straight drilled and rifled hole. Some are just more crooked than others. The smaller bores are the worst offender. Contouring them between centers only make them concentric at each end. Cut the barrel off and it could be off center. If you believe your pet barrel maker has sent you a perfect barrel, dial in the bore with the barrel in the headstock. Then put your indicator on the OD. It ain't gonna be perfect. I have chambered crooked barrels and in a benchrest or hunting situation found they shoot just as well. I agree with Malm, but I find no need to get my barrels hot enough to make them walk.
Butch