I loaded these 204 Ruger with 40 gr bullet about 4 yrs ago. These cases only had neck resizig and this was 3 times on reloading for a bolt action rifle with minimum headspace. I fired the split cases in an AR15 with .oo3 + on go gage. This was 18 splits in 25 shots. Has anyone else had trouble with the Hornady cases?

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The brass probably just needs to be annealed. The small calibers with thick necks really get a work out with factory dies. Stretching and shrinking a 204 neck by 0.015 works the brass a lot more than the same work on a 308.