You might try a chunk of frontier pad wrapped around a .410 brush and powered by a cordless drill. A soaking of Hoppes benchrest solution, gunzilla, or ballistol and then a polishing with the frontier pad on the brush should clean up the bores pretty well.
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"Where would a minister be without the help of sin, or the dry without alcohol?"
Gene Hill
Shotgunner's Notebook
"May the honkers fly low and slow."
Douglas Bandemer
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