tried the Underwood LeHigh Captivators in my seecamp.
Had a mixed experience. Wasn't able to do a chrono test yet, but they felt hotter than the Golddot .32 acp.
But the problem was that most fired fine, but one out of ten would have a hard primer and take a couple of trigger pulls to ignite. Seeing this was random, gave me worries about using this as my main carry. Firing pin and spring and Main spring had been replaced, so it was not the fault of the pistol. So maybe random hard primers?
My opinion, they were designed purely to do well in ballistic gelatin, appearing to create that "hydrostatic shock" that fast moving rifle rounds can create. I have a hard time believing that the damage shown in gelatin translates to a human though.
The same critique could be applied to hollow point bullets, since ballistic gel results are ballistic gel results. If you deny gel results of one bullet you have to deny them all.