Just curious - how much does it really matter if there is a small bend in a barrel? As long as the front section is straight and the pellet lands within the windage adjustment? The pellet leaves and continues following along Mr Newton's laws and doesn't keep curving in the same way as the bend once it exits?
Obviously a sharp bend will matter :-)
Must be some documentation out there on such a problem - is it just the recoil and harmonics of the barrel that is changed? Flip?