Are your cases all trimmed to the same length? If not that could definitely cause an issue.
Have your tried setting the die up for seating without a crimp?
I’ve never used the crimp feature of the Hornady dies, I use Lee factory crimp dies if I want to crimp.
I personally would not try to salvage those cases. I would break them down and salvage the components though.
Also, I don’t have any and don’t reload for any belted magnums. But they are different from the other cartridges you have reloaded for in that the belted magnums headspace off of the belt (as opposed to the head). Others with more experience in that arena may have more insight.
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