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Looks like it was a bad piece of brass to me with how the split almost went to the rim of the case.
Could have been just a bad piece that would have split anyway, but also could have been exaggerated with the below starting load you loaded with.
Pistol powder burns fast - dropping below starting loads can lead to excessive pressures in your chamber due to the fast burning powder and the increased air space you allowed with the lower starting load. I'm not saying it is the cause, but it could very well be a contributing factor. I wouldn't drop below published loads just like I wouldn't start out going above max published loads.
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