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With a rimmed case, if headspace is correct, case separation is almost impossible
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Its not as "almost impossible" as you would think.
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If the chamber is too large or the case sized to be too small, the case will simply expand to fill the chamber.
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This is absolutely true, but this is also when the case can separate. I have had complete case head separation in SMLE .303 rifles. It absolutely can happen.
The headspace can be correct, (proper dimension for the rim), and the chamber/case size relationship can still be excessive enough for cases to fail.
That kind of thing is seldom a problem when firing a round ONCE, as usually cases will not fail the first time. Usually. Reloaders, on the other hand have to pay close attention to avoid issues.