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Old January 25, 2013, 11:28 AM   #10
Mike Irwin
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Join Date: April 13, 2000
Location: Northern Virginia
Posts: 35,999
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.
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