My son this year shot his buck in the shoulder. It was quartering TO him. I told him to not take this shot in the future. Problem is he is shooting and xTec at 70 pounds. Not sure on the arrow weight but it is the CX 300 Camo with Grim Reaper 125 grain heads. It went right thru the shoulder and thru a rib on the exit side. Very hard to convince him that it was a poor shot to take with that kind of penetration. The buck went about 60 yards and dropped. I am not a user of mechanical heads but they did work great.