. . . And I used Swede’s copper cleaner before the last session and got very little blue out.
(emphasis added)
I'm no expert, but if that statement is accurate, then there is still copper in the barrel. And, if this is the standard that the barrel has been cleaned to over multiple shooting sessions, then it is likely there are multiple layers of alternating copper and carbon. Meaning, the problem is worse than a little blue on the patch would suggest.
While home doing chores, set the gun in a cleaning cradle and clean the hell out of it. Alternate between a good carbon cleaner and a good copper cleaner. Allow to sit for an hour or two between applying each solvent and wiping it out (using solvents safe for long soaks). Do this outside so you don't have to worry about fumes making Mrs. McInnis mad. Do multiple cleaning cycles. Do so until the patches are as white coming out as going in.
If the gun still shoots bad with your now- pristine barrel, then you will know to move your attention to the sighting system.
JMO
