Hunting darts for blowguns

OK so I just bought the cold steel blowgun and it's awesome. they have an great number of darts for hunting but i was wondering about a custom head design. i saw some great for a bow that i thought could be made to work with my blow gun. anyone see these guillitene heads for turkey hunting. well with a spring setup i think one could fashion something to work. the question is. Is just under 400fps enough power to make something like that work?

Oh and also, I also recently bought the big bore, and there is no way it shoots 400fps.
I think that it may work. Just keep in mind the weight of the Broadhead, because you may not be able to push it very far. Also, are you talking about the head that are like a cross with a spike in the middle?