Probably the best and least known product for removing copper from your barrel is KG-12 Copper remover. It is water based and more effective than most of all your products combined, and safe on your barrel.
I put a penny into a plastic Dixie cup with KG-12, within 36 hour 99% of the copper jacket was gone from the penny, but the alloy underneath was not harmed or pitted. I put another penny in Barnes copper remover; it didnít do much over the 36 hours. Try that with your current cleaner.
Folks who try it arenít sure it works because they donít see the blue or green coming out on their patches like they do from those other products. This is because thatís a chemical reaction with the ammonia in the solvent and KG doesnít have ammonia in. Believe me, its working. I only use it when Iíve shot 500+ rounds between cleanings.
Itís good stuff.