You really need to rethink your logic here. NO broadhead is made for "bone crushing". They kill by slicing tissue, not crushing bone, especially on bigger boned critters like elk.

Bullets kill by imparting shock to an animal's system. And they do it by mushrooming to a larger than original diameter and sheading as much energy as possible inside the animal.

The only correlation between the two is that they are both most effective if placed in a vital spot, ie. the lungs, heart or liver. There are stories of lots of animals surviving and running around after having a leg blown off (bone?) which just proves that bone crushing power is not what is needed in hunting situations.

Let me state that this analogy does not pertain to dangerous African game.