It's a little over 7% crit Sarri, and those 2x 75 mastery gems /droll. The gods must favor your BT crit chance;D
I can't seem to find where a WF Hellrender would be better than a Calamity with socket in any cirumstances(unless progression hue hue:P)
Edit: Question, are this for singletarget or for fights with multiple adds/add-waves?