I don' t think killing two deer with them makes me an expert but at least it does give some experience to draw from. One bow was producing about 65 lbs of KE and I didn' t get what I would call a complete pass through from an 18 yard broadside shot although it did punch the tip through the far side. The buck went about 110 yards and fell over.

The second buck was quartering away at about 28 yards the arrow entered the right flank and blew completely through coming out the left side of the front part of the chest (different bow 70 lbs of KE). It left a huge wound channel and an awesome blood trail. The 200 lb buck went about 60 yards.

I have never had a problem with them opening. If your judging them by the entrance hole in a target, depending on what material the target is made of, it can be very deceiving.