with a crossbow weapon
And here comes the deal: if you let sharp shooter stack to 100% and activate rapid fire ALL of the hits will Crit as long as you continue attacking. And you can attack quite a while with the bat and mortal enemy glyph.
Just equip increased crit damage and enjoy.
I'm 54 and do 12,4k dps when fully stacked.
Btw:this works with shadow power for high life leech while you attack.
Working as intended or is it a bug?
edit: If anyone wonders how it works: it is because attacks use the buffs the moment you shoot. Try it aout for yourself: use bola and shadow power....it will only heal you if you activated it before the shot, but not if you activate shadow power right before the explosion