Rain,
My point in offering this solution, I never said anything ablaut removing "rings of lead" on the face of the cylinder, as you'd mentioned. My point being, if you have a .357 mag. and shoot .38 cartridges in it, it can cause crud buildup inside the cylinder, THEN, if you choose to shoot .357 ammo, that ring will not allow those cartridges to fully seat into the cylinder. Throw it into vinegar and then into the microwave for all I care, I was just mentioning a simple solution.