To really pull double duty for whitetails that die if you scare them bad enough and bear that can stop cannon balls then chase you back up the tree is a tough call. For the whitetails you are looking for pin point shot placement and the most cut/bleed area you can create. With bear you want the same thing but you have to shoot through the equivalent of a radial tire to get to the vitals.
What I look for in a bear broadhead is “long & lean”. Such as the Woodman, Magnus Snuffer, Original Howard Hill, Muzzy Phantom or any blade the has a 3:1 ratio (three times as long as wide). Bear have a hide that is tough and VERY elastic, wide blades tend to deflect, not penetrate or even “skin out” when an arrow follows the layers of the hide from a high angle shot. A long & lean blade penetrates easier and penetrates deeper if not a clean pass through shot…perfection.
This also gets me into the mechanical broadheads. Bear with all of the fat, thick skin, hair, heavy bones and ability to close up a non-exit wound in short order makes the mechanical broadhead a very risky choice. Not to knock on mechanical blades but they just don’t have it for bear, I have seen some real bad hits from great placed shots due to mechanical blades not doing as advertised or busting apart at the steel cage bears use as ribs.
The advent of mechanical blades came when compound bows started breaking the 260 feet per second mark along with the lack of hunters tuning their bows. Mechanical blades where a quick fix for improper arrow flight at high speeds, if you are going to hunt bear take the time or spend the money to have your bow tuned! Get those arrows flying straight and shoot a fixed blade broadhead. Not only will it up your odds for a clean killed bear it will improve your range, trajectory, accuracy and in many cases will settle down and quiet up your bow.
My vote for a double duty blade for the compound archers would have to go to the Thunderhead or Muzzy (even if they are a bit short) for strength, durability and the chisel tip that does well with bone impacts. For those of use that shoot the long bows or recurves take a look at the Magnus Snuffer line and the Woodsman blades for some great cut on contact that have been proven bear droppers.
on deer and bear .
But many good fixed blades that will work just fine ! ( Thunderhead or Muzzy ) would # 1 on my list for fixed !
I am kind of an old dog, if it works, I stick with it 
Blood trails are for bad shots/broadheads…. 
JK 
