tackleberry ........
It makes almost no difference if the OPs cases were fired in another rifle or not.
The main thing that confuses handloaders, is that the first one or two reloadings work fine. However, the cumulative case stretching thins the case (above the belt) at every firing. Just cut open any fired belted case, and you can see it.
Unlike non-belted calibers, belted cases have one whopper of a case stretch at the unavoidable first firing.
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