Hugh: I think "destroy the accuracy" is a little extreme. Bobbing the muzzle will simply make the barrel the same as every other muzzle loading barrel out there all from reputable makers...ie: parallel bore. For what I'm charging for the retro, I will not be cutting off the breech, re-breeching, cutting new dovetails for barrel tennons, plugging the rear sight dovetail, and cutting a new one of those. And before I cut anything, I will re-fit the buttl plate at 14" lop and see how that changes the balance. The barrel might not need cutting at all. But the rifle does weigh 12 pounds, and the barrel is not tapered.