Atleast i think i got all the copper out , I filled the barrel with the outers foam let it sit for 30 minutes then mopped the barrel till there was no more blue on the patches then mopped it with kroil then used some more of the outers foam let it sit for 30 minutes then when i mopped the stuff out this time I was getting any blue on the patch, so i figured I got all the copper. Perhaps i did have a lot of copper in the barrel to begin with, just that you could see copper on the lands down the bore and after the treatment the bore looked like nice clean shiny steel. Also its a 308 win and has only had around 300 rounds through it before i used the outers cleaner, is that not enough rounds to severly copper foul a barrel?