The nickled cases will tend to split way before the brass ones do. They sould give you quite a few reloads. Cause of splitting tends to be from flaring them, then ironing that back out. AKA work hardening. As all metals brass will fatigue, and crack at a point. Like bending a coat hanger back and forth repeatedly.
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No matter how many times you do it and nothing happens it only takes something going wrong one time to kill you.
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