
Assembled the rod, patched the loop, pushed the rod down the barrel about 1 foot and jam. Pull back, no give. Seems the patch I cut was too big but however it's happened the rod jammed flexed enough that one of the joins in the rod had caught on a bur in the rifling (it's an old worn rifle).
Unscrewed the remaining rod with the front section still bowed inside the barrel

To get it out I attached it from the other end with a rod and a straightened fishing hook attached to try and use the barb to pull out bits of the jammed cloth. Figured that was better than hitting it back the other way into the rifling.
Too f***ing ages but finally it gave and sliped forward, letting me push the rod out from the action end again with the rest of it. I'm never doing that again...