Honestly, I doubt my selfbows put out half the KE of your setup. Yet, barring hits on thick bone, passthroughs are typical on whitetails. (Right now I' m using a 63# selfbow, 620 grn ash shafts, and cut-on-contact heads, travelling at 150 fps off the bow.)

This year I made my own broadheads from circular saw blades and bound them to my shafts with fine wire. I shot a doe with one the other week. The arrow took a chunk out of her front leg bone going in, destroyed her lungs, and lodged in her far leg bone, which I had to forcably remove when butchering. I was very pleased with that. With more force, perhaps it could have severed her legbone in two and passed completely though. I don' t know what it would have taken to achieve that...don' t much care really as dead is dead. Next year when I head to Alaska in search of caribou, I plan on using a setup very similar to this.

BTW, don' t worry about KE, as it is misapplied to archery purposes. If you look in any Physics 101 book textbook you' ll find that momentum pertains to circumstances of collision. Regardless, arrow and broadhead selection and tuning are just as critical to penetration as speed. Shoot what weight you can comfortably handle, then choose an arrow and broadhead accordingly.