I too got a Teslong scope and spent several days scoping my barrels. It was enlightening, some of my most accurate barrels looked awful, with Savage barrels being the worst, no surprise there.
I was surprised how much erosion some magnums had, also some pre-64 M70's in standard calibers had erosion, yet they shoot great.
I don't believe you can predict the accuracy by appearances alone. I did find flaws in several barrels. The best part of the borescope for me was to analyze cleaning methods and the effectiveness or lack of , with different products and procedures. It also made me appreciate stainless barrels more.
