With the Hexrifle if you suffer an unsaved wound you take a Wound char test, which if failed the model is removed from play with no saves allowed.
GW Apocalypse p91-Gargantuan creatures that would be killed due to a failed char test take d3 wounds instead. In addition sniper & poison need a 6 to wound.
So killed vs removed from play...and also is there any FAQ (like in the new FW Apocalypse Second edition) that addresses this?