Hey
@Bob Nelson 35Whelen, That'll do it- me likes it!
The problem, at least the potential, IMO, is this revolver has some age and an unknown background. If the gap is too little or it has been "worked" on or "tuned" up or the barrel changed or the cylinder changed out or the crane tweaked or so on and so forth..., it is hard to say the real issue. No way I would be so 100% sure about the cause of the binding up! The reliable, long term functioning of a revolver is mechanically, fairly complex.
There are two measurements that work in concert with a revolver- headspace and gap. There has to be some of both but if either is out of spec or not in concert with each other, the results can jam or bind the cylinder. End shake is a generic term thrown around by many that may mean either cylinder-barrel gap and/or excess headspace or some combination of the two. Too much headspace and it may become progressively worse as the case head continues to hammer against the recoil plate. As that happens, the carbon ring inside the cylinder chamber begins to move rearward causing fresh rounds to move rearward upon loading and sooner or later their bases will start to drag and bind on the recoil plate while simultaneously the practical cylinder-barrel gap tightens as the cylinder is nudged forward. Too little headspace and there will be continual drag of case head against recoil plate. Too much cylinder-barrel gap and an annoyance of gas and particles will be ejected. Too little gap will cause inevitable drag or binding, especially with dirty ammo or lead accumulation or a combination of the two. If uneasy about how to attempt a fix past a simple minimal washer shim correction, I would not go further and certainly get it to a gunsmith who knows what they are doing with revolvers.
