I killed a 300# boar in N. CA with a 125 gr. Thunderhead. The arrow quartered through from the right behind the shoulder and came out the left in front of the shoulder. He covered the 30 yards distance I was from him and dropped over dead right where I was standing when I shot him. (I wasn't there any more!) No tracking job, perfect broadhead performance. They're great heads once you get them tuned to your arrows and flying true.