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Message: <blockquote data-quote="farout" data-source="post: 816637" data-attributes="member: 39061">I always thought this had to do with the fact that the cartridge actually expands to confirm tightly to the chamber as the gasses are expanding and then contracts after the gases leaves the barrel, the brass then cools and springs back some from the chamber wall so that is is easy to extract. I belief is that the ring is showing the very back of the cartridge where the brass is thicker and did not expand to seal against the chamber wall. This is also the general area where case separation occurs, but that does not usually show on the outside of the case.I don't think this is the same as the pressure ring you seen in front of a belted magnum's belt. That is there due to the way the belt is used to headspace the case.</blockquote>