I use this with a max strength [Chroma Prime] with my friends to, obliterate Eidolons and bosses, such as Exploiter and Profit taker.
I have seen it do hundreds of thousands of damage with the Exodia Contagion (throw it, that's why I don't care about the attack speed being stupid low).
I actually believe I've seen a few million before but I've been unable to screenshot it in time to check, I also don't understand the math on how it would be that high. I just know most enemies with Vex Armor maxed melt when I throw it.

I fully understand this is not the most efficient "melee" build for this weapon, but it's not intended to be used as melee, at most I'll heavy attack with it, in which lvl 130 Grineer heavy gunners tend to get one shot or two shot from (after slash drains their health).

This is good and fun for me.