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Why does a smaller case (.357) with a much faster powder and a heavier bullet result in less pressure? I was told that a bottleneck cartridge does not increase pressure. What goes?
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A bottleneck cartridge case does not increase pressure.
you're looking at it backwards. The case design does not increase the pressure. The pressure comes from what we decide to put in the case.
Many, many other factors are at work, and they dictate pressures, case design doesn't. Case design can allow for use of higher pressures, to a degree, but doesn't create the pressure. Only the space to put the powder in.
Does a soda bottle create higher pressure than the soda can? It does not.