A thought hit me. I wonder if my barrel is excessively leaded. Might explain the bad accuracy. It's probably grasping at straws but I know I've never cleaned the lead out well. I didn't know you needed to do it with copper or clean it special. I know I've shot some lead through it over the years. And who knows who did before me.

How do you know if there is lead build up in the barrel? I'm guessing you can just see it?