Thread: Where did I go wrong

Looking for some forum wisdom, I have some now twice fired norma brass that I've just had to bin due to split necks. 24 in total of 100. Still have 10 to fire I think.

Shooting 35.5g H414 under 75g eldm in 22-250. First firing I only neck sized to tidy up the case mouths as some were a bit dinged up, second firing they still chambered fine with a stripped bolt so I only neck sized(wound out FL die) which is against my current policy of only FLS but did it none the less. No obvious pressure signs.

Will be annealing soon hopefully, just waiting on a hookup from a fellow member. Wont be loading until then. I've fired hotter loads in federal brass 4-5 times before having split necks. So where have I gone wrong?