I have been playing with a lightly used 22 .100 ppc barrel i bought, and its a bear to clean. It shoots lights out, but like i said its a pain to clean up. Copper and powder fouling. I had to use some of the remington 40x stuff to remove the carbon, or powder or whatever it is, and im not so sure i like this stuff. It left my stainless cleaning rods dull. I hope this isnt ruining my barrel inside, or making it more exceptable to fouling, than it alread is. I finally got it clean but it took a while. The barrel is a shilen and its a good barrel, so i just assume its a 22cal thing?? any ideas? Oh, I am using 8208 XBR. Its weird stuff but it cleans up nicely in my 6ppc. Also fellas whats your thought on this remington 40x gritty cleaning stuff? Like i said it sure made my cleaning rod look like crap. thanks lee