The one time I used a brass wheel on a blued part I ended up with the brass color in the bluing. But there's so many different brass and bronze wire alloys that it'll require testing on a hidden spot to find out if you have a wheel you can use or not.
Magellan mentioned sanding and polishing. The issue with that is that you have to remove metal around the pitting to lower the whole surface down to the depth of the worst pitting in order to remove the pitting and be ready for new bluing. It's like a farmer cutting down the whole field to remove a ditch vs filling in the ditch. With very light pitting this is not that bad. But the rust your guns have is way past that point. By the time you remove enough of the metal to permit rebluing your engraved lettering will be all but gone and the metal parts might become compromised for strength from the amount of metal removed.
Which is why I posted that you're pretty much stuck with living with the dark rust after oiling and wooling then or you need to consider filling the pits and one of the gun coating finishes to give them a fresh look and hide the damage.
The oil and wool trick is just about free. So start with that and see if you can live with the results. Then look up the cost of the work needed to re-do them on one of the gun coatings and I suspect that the rubbed over rust won't look all that bad after all.
As my dad used to say "A man on horseback at a fair clip would say it looks just fine".
And if it's to be used for hunting at least you won't have any worries about another little handling ding or two.
