I once bought an old Kettner hammer drilling at Jaquas for almost nothing. The 9.3 rifle barrel looked like a third shotgun barrel with no visible rifling. (This was a 9.3x72 which was always loaded with lead bullets.) I plugged the barrel with a rubber cork, stood it on the muzzle and poured it full of a lead removal solvent. Left it about a day, emptied and cleaned, and the bore was literally pristine. That ws the most leaded barrel I had ever seen.
With the shotgun, the 45 pads would seem to be a good bet. That is one of the things they are designed to do.
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