The marks are not chatter, and they will not go away with "breaking in a barrel" (which does not happen)... and they cannot be removed with tooth paste. But the good news is, they will not cause any problems.
They are tool marks from the original drilling - just about all mass production barrels have them - they are fine and will do nothing bad - if you sent the barrel back, you will get another barrel with the same stuff - it is part of the way production barrels are made - if you want better barrels, you have to dig much deeper into your wallet.
Yep, agree 100%. Definately not chatter from the button. The marks actually come from the chucking reamer that puts the barrel bore .001 under the button size which is done right after the deep hole drill. Sometimes the button will swage the marks out just as it swages in the rifling. Pretty rare in a Wilson barrel based on what I have seen. I have a Shilen that looks worse...but it shoots great and doesn't foul too bad. You probably shoulda kept that pipe...it might have made the best shooter you had.