I agree with everyone else. I keep a box with several different types of broadheads in it and try them systematically one right after the other. My favorite "tester" is a Snuffer. It's my experience that if that sucker will fly straight, the others usually will follow suit...not talking bad about the head by no means, but they have a lot more surface area to mess up the aerodynamic properties of the arrow while in flight. Another good "tester" head is a Simmons Shark. My experience is that if your bow is out just a little bit, those two heads will tell you really quick.