Even at that yardage and that poundage I would think you should have gotten better penetration. I would guess you hit a little higher than you thought and went into the loin muscle. With a high hit and single lung you would not get a good blood trail either. Chest cavity has to fill up before it starts running out the hole. Bow tune also could have a lot to do with it. At that range if your arrow doesn't hit square you will lose a lot of energy and penetration will suffer greatly. I use a 125gr 3 blade muzzy and have been very impressed with them.