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One must remember that chamber bore co-axis is on and x-y plane (vertical-horrizontal) not just lateral bolt notch induced alignment.
This is why barrel cylinder gap when adjusted must be as close to the same at 3-6-9 and 12 o'clock or the chamber will be out of co-axis and some what angular with the bore.
This really comes into play when end fitting arbors, shortening lower lugs and tightening up wedge fit. One can also see how a loose arbor thread wondering around at ignition would point the muzzle randomly.
This uneven barrel cylinder gap is why I believe open frame guns often shoot high and generally off to one side or the other although I have re-barreled or set back quite a few solid frame guns that suffer the same defect. In solid frame guns it often is because the barrel hole through the frame is not square with the frame or the threads are buggered up some. I haven't come up with a good fix for solid frame guns with this problem.
Open frame guns are much easier to correct in this regard especially when in the vertical plane .
This is also why I go to the trouble to install a new front target style sight in a dovetail so as to have both windage and elevation adjustment.
This is why barrel cylinder gap when adjusted must be as close to the same at 3-6-9 and 12 o'clock or the chamber will be out of co-axis and some what angular with the bore.
This really comes into play when end fitting arbors, shortening lower lugs and tightening up wedge fit. One can also see how a loose arbor thread wondering around at ignition would point the muzzle randomly.
This uneven barrel cylinder gap is why I believe open frame guns often shoot high and generally off to one side or the other although I have re-barreled or set back quite a few solid frame guns that suffer the same defect. In solid frame guns it often is because the barrel hole through the frame is not square with the frame or the threads are buggered up some. I haven't come up with a good fix for solid frame guns with this problem.
Open frame guns are much easier to correct in this regard especially when in the vertical plane .
This is also why I go to the trouble to install a new front target style sight in a dovetail so as to have both windage and elevation adjustment.
