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Thanks EBF.
I’l do a clean out with meths next time after the paste.

Its actually JB paste ive used.

Regarding fine rust: I don't think carbon fouling is protective against rust so some sort of oil in the barrel when you go out on a hunt seems a good idea. I mean oil the barrel with whatever your...

Same as the pull through dragged across the crown.

Any idea what the solvent was that caused the damage ?
I would suspect sweets or something else with a lot of ammonia ?

Have you got photos of any of those you could post ?

Has anyone here actually seen this ?

What did you see through the borescope ?