I think the pictures show a pretty extreme chatter example. If every barrel started out that way, I don't think any amount of lapping would improve it. If I ever get one like that, it goes straight back to the factory.

Quote Originally Posted by bigedp51 View Post
How do you "break in" a standard factory button rifled barrel, will a bore brush and copper solvent make the button rifled bore below smoother?

Below, the throat.



Below two inches from the muzzle.