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I had a case seperation, in a .243 Savage 99E. It was after a fair few reloads but they had been done in a whackamole Lee so no FL sizing done at all, I was a very novice reloader and it was my first...

If you have "loose pockets" but still feel you can get more life from the cases, you could change primer types. For example if you are using Feds you could go to CCI that give a tighter fit.
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