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Wrap some fine steel wool around a jag or make it fit tight on a brush. Work it hard and then inspect for lead in the wool. If you don't see lead, your patches may be showing actual barrel steel.Example; JB bore paste will turn dark gray to black when worked in a perfectly clean bore . It's barrel steel.Another option is an electronic bore cleaner.
Wrap some fine steel wool around a jag or make it fit tight on a brush. Work it hard and then inspect for lead in the wool. If you don't see lead, your patches may be showing actual barrel steel.
Example; JB bore paste will turn dark gray to black when worked in a perfectly clean bore . It's barrel steel.
Another option is an electronic bore cleaner.
