New barrels are always harder to clean than older ones. If I were you I would do the following after you firing session maybe 10 rounds at the beginning and more rounds later:

- run a couple of patch of solvent and wait few minutes
- run the brass bore brush back and forth a dozen times
- run a couple of dry patch to dry it up. Your last patch should be relatively clean.
- run a wet patch of copper solvent and wait few minutes
- run a nylon brush back and forth few times. Do not use the brass brush with copper solvent.
- run a couple of wet patches of solvent to neutralize the copper solvent
- run a couple of dry pacthes to dry everything
- run 1 oil patch
- run 1 dry patch
- put your gun in the cabinet, watch TV and remember that there is no such thing as a perfectly clean barrel.