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I fired a lot of surplus over the years and got a lot of split necks. I always thought that the brass hardened up with time
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Could be, but could be due to the NOx from old powder.
I loaded 700 LC Match cases with surplus IMR 4895. The stuff shot well but occasionally I got “funny” retorts and sticky extraction. Within a year of loading I got a high percentage of cracked case necks in fired ammunition. Then unfired ammunition started cracking.
I pulled all the match bullets, found a number with little green spots like the pictures above.
The powder had a neutral smell in the jug.
Old surplus ammunition is on the market for a reason. There is a reason it is cheap. The military that owned it did not want to issue the stuff to their soldiers. They also did not want the stuff auto igniting in their ammunition dumps.