Mike, How far off is it? If it is minute of Wolf at 50 to 75 yadrs by splitting the difference, I would just leave it alone. If it were mine and I wasn't going to re-regulate it, I would set the scope in for 100 yards using the left barrel and then shoot the right barrel first. If it is off very far, you will either have to put on some "Kentucky Windage" on the right barrel or try to experiment with your loads to see if you can get it to come together in the middle. Is it crossing the shots or spreading them from each other? If none of this is satisfactory, you get to have the pleasure of re-regulating it. Bob