Don may be right about the leading issue which can be addressed by the application of JB compound. There is probably a rust issue as well. Even if the active rust is removed, pitting will remain and trap fouling, contributing to more dirty patches. Joe's use of cold water is interesting. I normally pump hot water (with a little Lestoil & ammonia mixed in) through my barrels. The wet patch is followed by several dry patches which always come out clean and can be reused. After the bore is dry, I run a WD-40 soaked patch down the bore (mitigates any residual moisture) and follow that with a patch soaked with regular gun oil. The gun is put away until the next skirmish. Before shooting again I always run a dry patch down the bore to remove the oil. That patch may come out a bit oily but it is otherwise clean. If you clean your guns religiously as I do and don't let any rust/pitting get started, the temperature of the water should not matter.
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