bronze or brass brushes in SASS Wire Posted yesterday at 05:08 AM I had the same concerns, but I took the risk with the Tornado Brush. I now have a 2-1/2 year history of using it in both my own and my wife's BSSs, with both bores on both guns still looking like mirrors. There are no scratches evident, even in the chamber and forcing cone area, where I brush very aggressively. I might add that I usually brush the chambers and bores after about every two stages, so the Tornado gets hard service. I usually use it dipped in Hoppes #9 or after a spray of Ballistol. It clears out powder, plastic, and leading better than anything else I've tried. But I do follow it with a dry cloth patch. I buy the red shop towels at Harbor Freight and cut them into quarters. The quarters are perfect size for a 12 GA. I run them down the barrel, using the Tornado Brush as a jag. Fit is quite tight, which is what I want. I launder and reuse the patches. I also use the tornado brush with great success. I used to shoot BP with the plastic hulls and with a squirting of Vinegar Windex the black snot rolled out. I now shoot only brass shotshells and still use the Tornado brush even though no more black snot. Do not notice any scratching using the tornado brush.