Quote: "the cone was so unevenly cut all the way around that it would consistantly bind against the cylinder at a certain point"
If the cylinder rubbed the cone (barrel extension) at a certain point of the cone thru a complete revolution of the cylinder, the cone was not square and should have been trimmed square. If the cylinder rubbed the cone only at a certain point on the cylinder, then the cylinder was not square and should have been trimmed square. OR perhaps the cylinder axis rod on which it revolves has been bent and should be straightened. Good idea to check or have the barrel crown redone also but this may require bluing touchup later. If the cone was shaving bullets beforehand, perhaps it wasn't lining up with the cylinder chambers which again could indicate bent cylinder rod. GS may have taken easy way out by widening the cone instead of straightening the rod and checking cylinder alignment lockup.
Good shooting and be safe.