I rarely shoot my Savage 111 but I've found that the cases have been showing rings near the case head and one of the brass has actually cracked. These are of various factory and hand reloads so it's not ammunition related. Could someone shed light on this and how to fix this?

Here is the thread where I originally asked on The High Road with little success but a better and more detailed write up. This is something that has formed over time considering that older spent brass doesn't have the rings.
http://www.thehighroad.org/showthread.php?t=649482

First post