From my own experience, I tried Grizzly single beveled broadheads about 3 years ago. I even practice with them on a daily basis. I will admit that they was truly accurate as well as easy to sharpen. Come opening day, in the evening, I had a mature large doe approached and presented a broadside shot at 15 yards. I put the broadhead directly in the crease of the front shoulder. The doe did the normal, took off like a shot from a gun. So after 30 minutes I got down from my tree, found my blood covered arrow and a few drops of blood at the point of impact but absolutely nothing after that. So, I backed out until the next morning. Me as well as two other people could not find a drop of blood so we started a grid pattern search to where we found the doe about 80 yards from where she was shot. After finding her my friends and I did a investigation to find blood, "nothing", not a drop. There was very little blood under the doe where she expired. We truly looked for about an hour. Then we aimed are investigation towards the doe. The arrow entered the doe 1/3 down and exited through the lower front chest on the opposite side. There was absolutely no "S" channel wound pattern. The broadhead exited the body the very same way it entered the body. Needless to say I went back to Zwickey Deltas. For me, single beveled broadheads are not suited for hunting whitetails. I know, there are countless deer harvested with single beveled broadheads but lack the key element of what I'm looking for in a broadhead which is putting blood on the ground.