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Ctgs. like the British African rounds, loaded with cordite did not maintain their low, 38,000PSI or CUP when shot in Africa - their pressures jumped amazingly high - maybe scary high at times, so to keep their cordite-jumpy pressures safe they made them oversized for their actual performance - to keeping pressure moderate in extreme heat was important for the weak-compared to bolt gun actions.

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I can't remember its name ... but there was a less heat sensitive Cordite. Cordite as initially produced is not the same as what was produced at later dates.

But having a large case with great volume and pushing moderate speeds in comparison to what is achieved today with significantly smaller case capacity was an excellent way to build safety margins into the guns/ammunition of the times.
Cheers...
Con

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