copper fouling

I recently purchased a Teslong Borescope and regretfully there is not a library of images on google to compare my barrels to. Please provide any and all feedback on what I am seeing in the below images. I am intentionally leaving out round counts on the barrels to not bias anyone's answers...

Hi Folks, New to LRH and have a general question about the 7mm Mag caliber. Bought a new factory 7mm Mag barrel for my TC Encore and noticing my group size deteriorating after about 30 rounds through the barrel. The group change is so extreme, from less than one inch to over two an a half...