IIRC, HST is not Hydrashock 2. It is an upgrade of their Hi-Shok round.
You need to look at the LE catalog for the HST. I have a liknk on my web site and will post it later.I've looked at the Federal Premium Ammunition website and did not find HST rounds available. I could be looking in the wrong place, and would appreciate any help in finding the manufacturers reference to this ammo.
Also, I've see mention, in this forum and others, of tests that illustrate the HST ammunition is superior to Hydra-Shok ammunition. Does anyone have links to those tests?
Are HST standard pressure rounds or +P?