In cold browning a barrel, I have never used scotchbrite to card off. You have to be very careful or you'll be down to bare metal before you know it. I normally just scrub the barrel with a piece of terry cloth and very hot water. When the
barrel is wet you can tell how it will look when finised. When I have achieved the right brown, I scrub the barrel with a
piece of terry cloth using hot water and lava soap. Work up a good lather and really scrub the barrel, then rinse with
real hot water, I then apply some heavy oil and work it with my hands, kind of messy but it seems to work..........Don