I suspect that the Hex ammo was replaced by the DPX. They seem to use the same bullet which is made by Barnes. I don't know about the Taurus load but I've heard many good things about the DPX stuff. From what the testing that I've come across the majority of loads will even expand after punching through sheet metal (I think it was 16ga, car door). The only drawback is the price.
I know you can buy the DPX from Corbon direct. At the top there is a link for the Online Store. No, I don't know why its no longer Corbon.com.