Funny I saw this post; I culled this badly cracked R-P case from a batch of about 200 I resized last night. It didn’t feel right when the ram pushed the case into the resizing die… easy now to see why.
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I think this one only went three reloads before giving up the ghost. I didn’t see any sign of failure on the case when I initially picked it up and put it in the vibrating cleaner but I’m sure it failed like this during firing and not just during resizing.
I’m happy with ten reloads for revolver cases. I try not to hot rod my loads so I don’t think I am pushing the limit with ten.
I do have several nickel plated cases that are practically yellow, they’ve probably been loaded, fire, tumbled, processed and loaded again at least 15 times by now. Primer pockets are still ok and no obvious signs of cracking.
I also think the nickel cases are more brittle, but I like them for wadcutter loads so I know by sight what round I am loading.
Stay safe.