If you have a scratch in the chamber it will be from a chip stuck in a flute or chatter from a fouled or dull reamer.
That is probley be more than .0002 deep
It that is the case no polish will remove that without making a chamber out of round.
Now a scratch could be less than that and polished out but not from my experence.
A deep scratch polishing should at least reduce the edge that the case would stick too.
Polishing a chamber to remove rust is the main job that I run in my shop.
The OP has feeding scratches not chamber scratches.
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Last edited by guncrank; February 5, 2013 at 08:09 AM.