Here are some photos guys with the bore scope/endoscope that arrived from Amazon this afternoon. Not the best but it's better than nothing. The first pic is before cleaning again with the Sweets 7.62 and the second if after another cleaning. Not much difference in terms of what it got out. Initial cleaning pulled copper and powder fouling, but only about as much as expected, which wasn't much due to low round count.

I still have the issue with the 120s getting scratched and the 140s getting somewhat scratched and being difficult to close the bolt on, producing marring on the leade area. And yes, I scrubbed all around the chamber and leade areas with multiple brushes with no change. I'm stumped and luckily a coworker is good friends with a good gunsmith here close by, so hopefully later this week it'll be in his hands.

Before:



After (only change was added fuzzies):