I've been shooting for a little while now and this has been nagging me...
I do the usual routine when cleaning, use a brush and solvent, then clean cloth to wipe out the junk in the barrel.
For the most part it's all good. A bunch of crap comes out and after a few passes with cloth it comes out clean.
Looking down the action and out the barrel everything looks pretty shiny inside.
If I repeat the process though, when I do the brush and solvent there's always more black crap in the solvent, despite things looking good after the first round of cleaning?
I usually give it a quick clean after each shoot then a thorough cleaning after it's been used 3-4 times. Everything's working well except for this last be of black residue which never seems to end?