Bore Tech's latest cleaning rods have a "proof positive" tip. We you combine the rod with the Proof Positive Jag, you won't get false positives for copper!
It depends on the chemicals you are using. Some of the newer chemicals will eat a brass/bronze and you have to use a nylon brush.
I'm using Bore Tech's Proof Positive brushes. NO false positives from them!
Looks very good. In the chamber area you could use a couple of patches soaked in a carbon remover and stuff them into it. Let them sit (as per solvent instructions). A chamber mop can help clean it up or just some patches with a small pick.
You might want to check out the Action Cleaning Tool...
Been using Varget and I don't find it to be "Dirty". Using Bore Tech products with a nylon brush gets my bore very clean. Some of the new cleaners will start to eat away a brass brush so watch out for that.