Tikka T3 Barrel / Yuck

I purchased a used Tikka T3 Tac A1 awhile back at my LGS... Been to the range with it a few times and functioned fine - Groups seemed a bit open but I was shooting junk 308 and didn't think much of it. Took it over to a friends after shooting to work on it and he put his bore scope down it - Yuck. Not really sure what I am looking at but appears to be pitting? rust?

How would you recommend I proceed with the barrel? Thoughts?

Thanks for the input
 

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This is where the "I don't need to clean my barrel" argument falls down. Seems like the previous owner shot it hot and put it away dirty in a plce with no climate control.

But, yes, give it a good clean with an oil based cleaner and a bronze brush and see how it shoots. From prior experience with a badly pitted barrel; they can still shoot very well.