Ever seen a 10mm or a .45acp can do to a 4x4 post? hehe
But no, I have not seen or shot any hydrashock ammo. But if I buy another pistol, it will be a .45 acp. Cobb PD went thru the gambit of calipers until they settled on the .45 (last that I have heard, not sure they have changed again) because everything else just did not have the knock down power. Shooting a person (the whole reason we carry for protection) is a lot different then shooting a wooden post. If I have to shoot someone, I want to make sure they go down, stopping their aggression quickly.
Granted that even a .45 may not stop a drug crazed and pumped up attacker on the first shot, but it does stand a much better chance after the second tap to center mass. But dang they are heavy and hard to carry concealed.