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It would be interesting to find a fairly long straight metal rod that is near bore size and at least a foot or more longer than the barrel. It could be placed in the barrel and then see how much the rod runs out from the line of the barrel.
Also, it seems to me that sights are never exactly parallel with the vertical plane of the bore, so placing the run out vertically would be compensated by sight adjustment in the same way we compensate for projectile drop. Some of the old sources I've seen for building a rifle suggest doing this if the barrel is not bored true.
Also, it seems to me that sights are never exactly parallel with the vertical plane of the bore, so placing the run out vertically would be compensated by sight adjustment in the same way we compensate for projectile drop. Some of the old sources I've seen for building a rifle suggest doing this if the barrel is not bored true.