No, I know that. It's just my understanding that these bullets were supposed to expand at a low threshold of about 700 to 750 fps.
As far as water goes, Fackler has a simple formula to correlate the expansion and penetration in water (even a standing column like a garbage can) to expansion and penetration in gelatin. Not sure what it is right off the top of my head, but it apparently shows pretty good fidelity between the two media.
"The gift which I am sending you is called a dog, and is in fact the most precious and valuable possession of mankind" -Theodorus Gaza
Baby Jesus cries when the fat redneck doesn't have military-grade firepower.