I have used them once on a young eight point buck that was maybe a two year old. At that time I was pushing somewhere around 65 lbs. of KE.. On an almost broadside shot I didn't get a complete passthrough. I didn't think the blood trail was all that special either.

In addition to the penetration problems I didn't think the quality of the head itself was very good either. Fragile, not everyone spun true either. I consider them to be junk. One persons opinion based on experience, take it for what it is worth.