For best penetration on heavy game, I would recommend as the others have to maximize your KE with what you are shooting and look for a good quality cut on contact head with a 1-3 ratio. This will give you the best penetration possible, and if you can find one with an open design, you should have very good flight with them, and have minimal planing. I switched to razorcaps because of their open truss like design. I blew through elk scapulas and bear spines with ease and minimal damageto the broad heads. The 1-3 ratio should easily wedge through heavy bone as long as the material the head is made from is rather hard. I have no doubts that this combo will take on the heaviest of bones in a 700 pound bull............No doubt mechanicals will take down big animals, but I want the extra insurance. Sometimes it is hard to out do old school technology, especially in cases where we are less than perfect, and I make my share of mistakes.