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I've loaded them 3-4 times. Today, while reloading, I found a circumferential crack in one near the case head.
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How hot are you loading those?
I use brass for 3 firings for full house hunting loads (150 grain at 2925 f/sec out of a .270 WIN) and them hey go into the prairied dog load boxes (100 or 110 grain at 3000 f/sec.) .... some of those have been fired ..... ??? a dozen ??? times or more..... I neck size with the Lee Collet die.
The case necks eventually crack, but I have never had the case head crack.
I suppose if I annealed the case necks, they'd last forever.