Regarding the broadheads you mentioned, Iron Will and QAD Exodus are both solid, well-built heads, but neither has the single bevel that helps an arrow split the bone with torque. The Exodus has repaceable blades which is convenient for keeping your heads sharp, but they tend to break when they hit bone. The Helix single bevel is the most likely to break heavy bone of the heads you listed, but the flared base of the blade is likely to hinder penetration compared to a long, straight blade.
If you havent read Dr. Ed Ashby's reports on this topic, take a look at this compendium:
If you havent read Dr. Ed Ashby's reports on this topic, take a look at this compendium:
Ashby Bowhunting Reports — Ashby Bowhunting Foundation
Dr. Ed Ashby has provided us with decades of critical research focused on arrow and broadhead penetration. This work stands alone and provides global leadership in the areas of bowhunting lethality and ethical hunting practices.
www.ashbybowhunting.org