According to your research and opinion, are there any weaknesses in…

According to your research and opinion, are there any weaknesses in the modern case design that can be improved on? If so, what might be altered to improve the design and what effect would it have on the ballistic performance?
What forces contribute to a case swelling and contracting once it has been fired?
How might the surface of the chamber affect ballistic performance?
How does the material of the casing affect the expansion of the casing and, therefore, the ballistic performance?
In all of the casing types, how is headspace measured?
How does the shoulder angle, in bottlenecked cases, affect the performance of a cartridge?
Why are some cartridges measured using the metric system while others are measured using the standard system?
What would happen to a standard cartridge if it is ignited outside of a chamber? Why?

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