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...cleaned it thoroughly with Hoppes #9...
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...cleaned it with the ammonia and water patches. A week later I ran a patch down the bore, it was covered with red rust...
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The corrosion is caused by the metallic salts from the primers. Oils and solvents do not dissolve the salts - the scrubbing may physically remove some of them, but will just re-distribute the rest. Regular clean water will dissolve and remove the salts. Anything more (ammonia, soap, etc.) is either ineffective or overkill.