I just finished cleaning my new 642 after its first trip to the range. It shot like a laser! It cleaned up very well except for the area on the front of the cylinder and forcing cone area. There are black powder blast marks that simply can't be scrubbed away. Is this normal? I'm using a nylon brush to do the brushing. I'm a bit hesitant to use a brass/bronze brush on the gun. The cylinder chambers are also very clean except for the areas where the chambers start to narrow into the forcing cone area. The carbon in those transition areas is a bit hard to get out with a bore brush. I'm assuming this is normal? Any tips or trips would be much appreciated. Thanks!
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