I shoot Big game 100's weighted to 755 grain, I am using outback chisel point broad heads and they are the best I have seen for penetration especially when hitting bone. Shot from an 80lb bow I saw this arrow break a buffalo rib in half on entry and split a rib on the other side traveling through the animal at a 45degree angle. The Broadhead was sticking out about an inch on the opposite side. Make sure your bow is tuned correctly as the hides on these things are super tough and the last thing you want to see is an expensive trophy running off with your arrow hangging out of it!