Two comments:
1) I've found it easier to use a carbon solvent to get most of it out, than brush it. One of the benefits of being a gun writer is cleaning-product manufacturers sometimes send me samples. The one I generally use KG1 Carbon Remover, but there are others.
2) Dan Lilja not only knows how to make great barrels, but also knows how to shoot rifles very well. He firmly believes that ALL carbon should NOT be removed when cleaning. You can find out why by going to his website and clicking on "Support" at the top of the page, then click on "Centerfire Maintenance" in the drop-down window.
