The only things that gets blued that I do not polish is rib mating, I use a fine wire wheel for that. Everything else gets polished in line with the bore using backers of various types, I usually stop at 400 grit, I will go higher if I want a high luster blue.

These are great: https://www.amazon.com/Polishing-Woodworkers-Automotive-Sandpaper-Woodworking/dp/B086YXR9RH?th=1

Also hobby polishing sticks from Steve's Hobby(I'm in no way affiliated wink )


Tongue depressors with abrasive paper stuck to them are handy as well.

As a final step to my polish I run the barrels over a carding wheel(I card by hand) and the wheel homogenizes the finish nicely removing any trace your polish paper has left behind. When Nitre bluing I use a similar process but buff on a felt wheel with fine compound right before heating the part you are going to color.

http://www.bertramandco.com/
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