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Oh, and pay no attention to that Internet lore about a short barrel not giving sufficient velocity to expand a modern JHP. Here's a HST I fired into water with my 3.3" Springfield XDS.
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While it is true that modern premium quality self-defense JHP rounds are pretty good at expanding even from compact guns, it is worth pointing out that water testing generally results in more consistent and more pronounced expansion than is usually produced by more conventional and representative gelatin testing.
I'm not saying that round wouldn't have expanded in gelatin, just cautioning against assuming that water testing results are representative of what would happen in the real world.