Hydrashock -actually Hydra Shok- have a tungsten rod down the center of the hollowpoint to increase expansion , while this actually reduces penetration the Canadian powers that be see it as a variation of AP rounds that use a hardened rod down the center of a FMJ to increase penetration and for that reason we don't get them for sale to the general public here in Canada however if you go to Webyshops.com in the US you will find them there at least in the caliber I picked at random which was .40 you didn't specify what cal you were looking for but it took me less time to find it than it did to type this .