I carry Hydra-Shok in most (all?) of my defensive handguns.
.45 ACP
.40 S&W
.380 ACP (Though I think I'm liking the the Hornady Critical Defense in this caliber.)
I even have a box or two in .38 Special, though I've never owned a .38/.357. Bought it just in case I get the gun. Be Prepared.
I'd like to try the HST. Might consider switching from Hydra-Shok to HST if I can find some side-by-side tests of the two vs. gelatin, through barriers, through heavy clothing, etc. I know what the Hydra-Shok will do. I think the HST might do it a little better, but I'd like to see data to back that up. (Or just send me a bunch of ammo and I'll do the tests myself
)The way it is right now, we can't be too picky. If you find something close to what you're looking for, at a price that's not too insane, better grab it.