Never thought I needed to use CFE223. I take a different approach, learned from a 204 Ruger shooter. I clean the new barrel thoroughly to remove the factory dirt and cutting oils. Once clean, I run a patch soaked with Lock Ease to coat the barrel with colloidal graphite. This seems to penetrate the micro voids in the barrel and bar the copper build-up in the barrel. The graphite also seems to act as a fouler. I then will begin shooting and not clean until after 50 or so rounds.

After normal barrel clean-up I again coat the barrel with Lock Ease. I find that I do not have that dreaded clean cold bore shot next time at the range. These are my experiences and may or may not work for you.