I have run some tests on them and in fact took a buck with one. For what it is worth I can't give them a good recommendation. In my opinion the ferrule is weak and it takes an enormous amount of energy to get the head to pass through a deer. At about 15 yards I couldn't have stabbed the buck in a better spot and still did not get a pass through. With the particular setup I was using that day it generates around 60 lbs. of kinetic energy so it isn't by any means below average in that department. I did recover the buck he only ran bout 80 yards but the blood trail wasn't that good either. If you are looking at them because you want to do more tissue damage than a conventional fixed blade head, then I would recommend one of the larger cutting mechanicals. Even they would penetrate better than the "cookie cutter".
