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I have used 400 grit to smooth up a bolt on a relatively inexpensive savage rifle.
But the most success I have had with making an action, particularly a trigger group, work smoother has been from using a product called moly fusion.
Its a liquid moly treatment, its easy to use, does not cost much and you are not going to ruin anything. The effects from it have always been noticable and pleasing.
The previous posts on cutting through the surface hardening on any part are well worth paying attention to. You can easily ruin a part and make a dangerous gun.
After trying the moly fusion one time it became the standard treatment for all of my pistols and rifles. At least the ones I can fully detail strip and put back together.
I don't think there is a general rule of thumb to answer your question with because there are so many differences between guns. What works for one may cause you a problem with another.
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