After 2-3 firings you really need to anneal the case necks, some would say after every firing. Brass in the neck becomes hard after repeated firing and working in the die. It’s looses its spring back potential and you end up with variable neck tension and accuracy suffers. You’ll also get split necks. There’s a guy on TradeMe offering to do induction annealing, and I think on this forum also, can’t remember his handle
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