Hydroshoks are an outdated design and they have a tendency to NOT expand after passing through clothing. I used to carry the PMC Starfires until I found out they had the same reputation as Hydroshoks and tested it for myself. Sure enough, great expansion in water until the bullet had to pass through fabric then nothing.
I have also personally had Golden Sabers and Hornady TAP fail to expand in water.
The tests I've seen on the Hornady Critical Defense are at about 50/50. Like many hollow point bullet designs they work great...until they have to pass through fabric then you get inconsistend so-so performance.
One of the most consistent SD ammunition choices out there, and what I carry, is Corbon DPX. Don't go with the old Corbon JHP as it also tends to not expand after passing through fabric.
I believe the Federal HST ammo is getting good results in independant tests as do Gold Dots.
There are a lot of water jug + fabric tests here:
http://www.bersachat.com/forums/forumdisplay.php/66-Ammo-Jug-TestsBronson