As far as cleaning solvents go I use bore tech, which has been working great for me! I am sure that i got all the copper out but i can't say I'm 100% sure that I got all the copper out. There are some times that it takes a lot longer to clean then the previous time! Could this be because of different layers of deposits? As stated previously I clean my rifle every 50 rounds. I have not inspected the crown of my rifle! That is a good possibility! I will look into it and see what I can find.
Thanks to all