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Excellent example of what I was talking about in my post.
The size constraints of the handgun that the round was made to operate in and the operating pressure constraints worked together to ensure that the performance of the round was basically a duplication of existing rounds and offered no new benefits.
If the round had been made significantly longer, then it could have outperformed existing rounds, but the grip of a firearm designed to use the round would have to be quite large--effectively beyond the size of any practically sized handgun grips. In fact the gun the cartridge was made to fit in at its final design length is already one that draws common complaints about a grip that's too large.
Furthermore, if it could have been made to perform significantly better than already existing rounds, it's not clear that there would be much of a market for it given that recoil tolerance does create a practical (though inexact) top limit on performance. That's likely the reason that the rounds that it duplicated are not at all commonly used.
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