Not a problem with the really fine stainless wheel. I would work over the bolt with a backed sanding block and then use the wheel only for imparting the scratch pattern. It removes practically no metal at all depending on the gauge of the bristles. Don't remember which I used but it was the finest grade Brownells had at the time. Possibly 420?

With a course wheel you could do some really serious damage very quickly. The super fine wheel will only remove the Parkerizing very slowly.

"When you disarm the people, you commence to offend them and show that you distrust them either through cowardice or lack of confidence, and both of these opinions generate hatred." Niccolo Machiavelli