With 4 SASS shooters in the family shooting Ruger 45's we reload bazillions of 45's on our Dillon 500. I've never had a case split after a first loading regardless of brand. We look after each match and toss the split cases, they start to show up after 4-5 reloadings but it's not consistent as to failures. Your load is not excessive, just basically a Cowboy load. I'd write to the factory and see if they will replace them. It's not a common problem so maybe just a bad batch.
Cherokee Slim
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NRA,SASS,BOLD#808,Semper Fi
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