From what I understand, the pilot for the cutter must have been bent. Impact would most definetly be off too. It must be cut square and crowned square, for any accuracy to result. I would find a new smith if he tells you anything differant. I had a smith thread a barrel for a muzzle brake
on a 378wby Ruger #1, it was paralell but off center and bullets struck the brake. His fix was to open the ID. of the brake. This opened my eyes to his aptitude and cost him my buisiness.
Have it redone is what I would do, or do it yourself.