With that light of an arrow and those speeds your arrow will probably just shatter at impact.

Just kidding of course,with a 400 grain arrow with a fixed broadhead with that kind of kinetic energy you'd penetrate just about any critter. Just curious, but with your speed and arrow weight it does appear you could add some arrow weight, still get 300 fps and probably get even better real world penetration. I have seen far to many animals hit with fast/light arrows compared with real heavy/slow arrows to not understand that the added weight does create "punch". Youhave plenty of punch, but I bet you could get more out of it and still have a real flat shooting 300fps set up.