I have been reloading my own ammo for many years and have never come accross this type of thing ever. I bought 100 rnds of unprimed Winchester 30-06 brass around 15 years ago. I had loaded all of the shells with a load that after test firing did not work in my rifle. I saved 80 rnds that I pulled with a kinetic bullet puller. I fired off all the primers and the ran them through the dies to size and pop the primers out. I inspected all of the cases and found 38 rnds that had various types of splits or cracks on the necks and when I look close at the cases they even look deformed. Did I do something wrong? Did the brass go brittle from sitting? I am stumped because the brass has never been fired other than a primer only. I have other brands of brass that have been reloaded 12 - 15 times.
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