Bore Scope and Barrel Maintenance Questions

I used my bore scope for the first time and I realized I don’t know what normal use looks like in my bores. I saw lead streaks on the lands, smeared squiggly lines that appeared to be in oil or grease, small flakey sheets and patches of lead in a slug barrel, bands of lead in a pattern almost resembles the pattern of bands on a coral snake, and I saw what looked like scratches inside the bore. I saw what may be spots of corrosion and rust in a barrel. I was also able to view the condition of my bore crowns and the magazine to barrel alignment of my Huben.

Mod BenBull .357 Flakey Lead Sheets in Barrel 5-7-23 .jpg

E. Lelya 2.0 .25 Leading and Rust? on Rifling1 5-7-23.jpg

BenBull .357 Lead Bands:Stripes in Bore 5-7-23.jpg

E. Lelya 2.0 .25 Scratches? on Rifling 5-7-23.jpg

Mod BenBull .357 Rust? Spots in Barrel 5-7-23 .jpg

I’ve been paying attetntion to how the barrels shoot. My slug barrel needs cleaning based upon the way that it shoots and looks. I’m thinking that the squiggly lines in what appears to be grease come from the fletching on air bolts shot from a cleaned barrel then shooting a few slugs afterward. It doesn’t look bad. I’ve only used patchworm kits to clean my barrels. Some of these barrels I’ve never cleaned.

My questions are:

1) What is a good source to reference for visual comparison of airgun barrels in various conditions (with bore scope photos)?

2) How can I positively identify rust and corrosion inside of an airgun barrel?

3) What’s an efficient remedy for removing spots of corrosion or rust in an airgun barrel?

4) When are more aggressive barrel cleaning methods necessary?

5) What are your preferred methods of aggressively cleaning your your airgun barrels?

6) Can I see the choke in a barrel with a bore scope?

7) How do I identify manufacturer imperfection in a barrel?

8) How can I identify tight spots or uneven spots in my barrel? Spots that may lead easily which in turn may throw some of my shots off target.
 
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I found this video helpful in beginning to understand things about these barrels like various types of battles and some basic manufacturing differences. It also helped to answer some of my questions. I use a similar borescope, only mine does not have a dedicated monitor.


Here’s a video on barrel polishing. I’ve never done this, but I’m pretty sure the presenter left out the part where he cleaned the polishing compound from the barrel before reinstalling it and shooting his gun with a freshly polished barrel.

 
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