Jetinteriorguy,
Glad the MM is working.
Cdoc42,
You've reminded me Gunzilla might also have done it all by itself. It can be slow, but a good penetrant. I'd forgotten that the first time I tried it (samples were being given away at Camp Perry then, as it was a new product) I had a stubborn carbon/moly ring at the end of my match AR chamber in the corner of the step at the end of the chamber neck to the freebore that no amount of brushing, abrasive cleaner or conventional bore solvent would get out. I put some Gunzilla in and got distracted and left it for 24 hours. When I pushed a dry patch through the next day it came out with this little carbon ring on it. The borescope showed the stubborn spot was gone.
So that little corner I'd forgotten about was the one instance where moly-coated bullets caused me bother, though plain old carbon can build up there, too. It was mostly psychological trouble, as the black ring didn't seem to affect accuracy, but I didn't like it being there and was glad to have found a way to remove it.
I'm also reminded that Hummer70 recently told me that ZEP 505 will get under and lift the asphaltum sealant off pulled military bullets in just under 24 hours. It might be another agent that would make it possible to patch this Bear Creek stuff out.