I keep seeing posts regarding rifle and handgun chambers, with advice to polish chambers to a mirror shine.
That is generally not good advice. When a firearm is fired, the pressure forces the cartridge case walls out against the chamber walls. That reduces the backward pressure on the case and the force applied to the breech face.
But too smooth chamber walls reduce that grip and pressure on the breech face is increased, just like oiling the chamber (another piece of very bad advice.) Manufacturers ensure that chamber walls are polished enough that there will be no extraction problems, but not polished so much that pressure on the breech face will be increased.
Unless there is something seriously wrong with a chamber, put down the emery cloth, crocus cloth, Flitz, etc. Chances are good that that "rough chamber" problem is in your mind, not the firearm.
Jim