Usually a regular "Joe" like you and I would go to the Smith and get him to borescope this barrel
And I would too if A) I could afford one and B) If there was a decent one in my area without a 2 hour drive
I know the barrel was clean, because I had just finished scrubbing it myself. But the "specks" were still pretty apparent.
The rifle does do a lot of sitting around with it's current owner and doesn't get fired much.