Thread: Copper Fouling

I have a new .308 xbolt that I've put about 140 rounds through at the range and Ive finally found factory ammo that I can get .7moa groups.
I've cleaned everytime afterwards using the GunSlik kit cleaning stuff, but have noticed a bit of copper on the lands when looking down the barrel.

Should I be worried about worried about trying to get all the copper out, and is it normal to have some as long as I've cleaned the carbon out .... how anal do I need to be if its shooting well, should I just go with it?