Steve mentioned stainless steel brushes and I assume that these are the "Tornado" wound-wire brushes. I'd use these with caution and some solvent and/or oil as these are much harder than bronze bristle brushes.
In my opinion, these brushes are good for trying to get leading out of the forcing cone but not general cleaning (your experience may vary). Remember that a steel brush will be more abrasive to the bore than bronze so at least use them with solvent to add some lubrication.
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BillCA in CA (Unfortunately)
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