New bore scope...what is in this barrel? *Pic*

I got a new ($50) bore scope from Amazon.
This is the bore on my beloved Savage 110 Tactical .223. I have neglected to clean this rifle properly in the past....mostly just snaking it after shooting. After viewing it with this outfit, I decided to do it right.
I have tried several things including Kroil/JB bore on felt pellets. It still looks like some sort of deposit that I just can't remove.
Can anyone tell by looking at the picture what that white deposit looking stuff is???

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