How To Polish A Chamber.

what i do is quick its dirty and it works well to stop the primers from being raised after you shoot a round,this is from a rough finish or corrosive wear or rust etc on the chamber wall.what i do is take an aluminum .22 cal cleaning rod and tape a 2 inch section of 600-800- grit emery paper to the very end,wrapped tight so it has some room to flop in the chamber and expand to soft polish the walls without damage of ruining them.soak the outside of the paper with oil and then chuck it in a low rpm drill,never hit the shoulders so feel first ,mark the rod with a tape or felt pen and dont go past the mark,the idea is not to mirror finish the walls of the chamber but to polish them evenly and bright.when the round ignites it will let it slip back just the amount it needs to be flat on the breechface,with a filthed up rough chamber it cant do that so thats why the primers raise up after firing the cartridge.apply power for 30 seconds at a time going back and forth to the mark you made.pull the tool and rod out,wipe the chamber out and inspect.rough ones can take up to 15 passes to clean up,re oil often and make sure that there's a patch in the neck area to keep the fouling from going up the bore. the rifle should be held in a padded vise in a leather pad so its solid.clean from the muzzle to the breech, then when sure its all out clean from breech to muzzle.the primer raising should be stopped cold and you will also note no more scoring on your brass cases too.