Help interpreting borescope pictures

[pertnear]

Brownell recently had a sale going on for Teslong borescopes so I bought one. I'm having a problem interpreting the pictures I'm getting from a rifle I recently bought. I plan on using the action for another project but the rifle shoots pretty good. The view with my new borescope show the barrel to be horrible! So I performed 2 sessions of Thoroclean & then 2 sessions of Kroil/JB spending the good part of an afternoon scrubbing on it. Looks much better now but can someone interpret these black blotches in these pictures? Is this carbon? I ran some Butch's Bore Shine through it but no change. Can it be removed with a chemical cleaner? Your comments & suggestions are most appreciated.

 

[BoydAllen]

corrosion of the bore surface, cannot be fixed

 

[Walt Krafft]

Rust. Shoot it. It may shoot good as is, it may need to be shot enough to fill that back in to shoot. I dont think anybody has figured out how to look in a barrel and decide if it will shoot.

 

[222Jim]

Hard to tell, but it looks like pitting caused by copper/iron galvanic corrosion. Yeah, sounds like Greek and less than helpful. Try this website for hopefully more useful input

An NRA Shooting Sports Journal | Let the Barrel Tell You: Match Barrel Care, Part 1

Why worry about a little barrel fouling when the throat is subjected to a brutal 5600° F volcano at 55,000 PSI?

www.ssusa.org

Cheers

Jim