I normally stop cleaning when it seems pointless. I have never run a patch through a bore that it did not come back with something on it. Even my benchrest rifles that I clean about every tenth shot still show something on the patch even after a bunch of patches.
I run a couple patches wet with powder solvent thru the barrel on a bore brush then follow with a few dry patches and they look dirty so I run another wet one thru and then follow with a few dry ones: still have smudges on the last patch so I say the heck with it and go back to shooting.
Similar story on my other rifles even when I start with copper remover or lead remover .
What is normal?
Tim