I have had excellent results with Mark Lees solution and usually use it for all browns.I cant tell much difference using the CUSo4 etching solution.
I do not use wet carding and usually let the barrels rust for at least 6 hours. I alternate between Ooo steel wool and a carding brush. After 4 or 5 rustings. Swab and card with steel wool with a 10 percent ferric chloride soln and rust again a couple of times

Last edited by Stallones; 12/09/13 08:54 PM.