Use a borescope for cleaning. And when the barrel is getting up in rounds and starts acting up. Verify it’s the barrel burning out and not carbon screwing its up.
Using a borescope for anything else is just going to confuse you.
My .22-250 is a lot more chewed up than that. Yours looks fine...what is the round count?
Try some JB bore brite on it you’ll be surprised how much of that will clean up not going to make it new again but should improve itJust for fun...here is the throat of a 50+ year old .243 that my dad gave me. Lots of fire cracking and erosion of the lands. And yet it still shoots minute of deer.
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It had so much crap in it when he gave it to me...I plugged the end of the barrel and filled it with C4 overnight. The next day all this brown sludge came out. It actually looks worlds better than before. But yeah, I have some JB and might have to run it through just for fun. It's an interesting gun, and old BSA out of England. The barrels are supposedly cut rifled using the "spill boring" method. While the barrel has seen better days the action is soooo smooth.Try some JB bore brite on it you’ll be surprised how much of that will clean up not going to make it new again but should improve it