How do you move the plumb bob from the breech end to the muzzle and keep it centered? Or how to move the barrel under the plum bob and keep it centered? A milling machine with a lot of travel would work but not many people have access to that. Maybe that's why octagon barrels were thought up?Assuming you can identify the breech end's center Hang a plumb bob so it just touches touches the top of the barrel on the breech end. Plumb bob just touching the muzzle end will also be just as centered as the breech end.
How do you move the plumb bob from the breech end to the muzzle and keep it centered? Or how to move the barrel under the plum bob and keep it centered? A milling machine with a lot of travel would work but not many people have access to that. Maybe that's why octagon barrels were thought up?
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