Has anyone ever done this? I was reading on a Mosin Nagant forum that one of the ways to eliminate a "sticky bolt", which can be very common on Mosin Nagant rifles, is to lightly polish the chamber. There are several ways to do this. One of the more common ways is to cover a 20 gage bore brush with light cloth treated with a polishing compound. Then attach it to a cordless drill and slowly work it into the chamber allowing it to conform to the chambers shape and remove any Shellac, old congealed lube, rough spots, etc.
I thought of perhaps taking a fired case from the same rifle and doing much the same thing. The case would be a perfect fit, (as fired and not resized). You could drill out the primer pocket and tap it for some 3/16 or 1/4-20 threaded rod you can get at any hardware store. By using a jam nut against the back of the case to prevent the case from slipping, you could cut off enough of the rod to allow you to attach the other end out the back of the action, and chuck it in a cordless drill. You could remove the case rim with a file so the case would better contact the chamber walls and shoulder of the chamber.
You could cover the fired BRASS case with polishing paste like Simichrome or else Flitz Metal Polish, and place it into the chamber. By allowing the drill to turn slowly you would cover the entire chamber area evenly with the exact same pressure. Flitz and Simichrome remove very little material, and really clean up a metal surface nicely. Being as the brass is far softer than the steel chamber it would wear and become "charged" with the compound, not the chamber itself. I just wondered if anyone has ever tried this, and if so what results did you obtain? Bill T.