Below is a link to a website that did broadhead testing from a machine focusing on accuracy and penetration. The Siptfires were tested along with some other fixed and expandable heads. No test is perfect, but I though this test was one of the better I've seen. The machine was setup with a Bowtech bow that hit the same entry hole everytime with a field tip, then they put on broadheads. As expected, expandables proved to be more accurate. What suprised me was the Rocky Mountain Snyper had the best penetration, also was most accurate and went through plywood without damage. I've never shot expandables for various concerns but this video really opened my eyes to expandables. I think I'll be trying the Snypers or Rage heads next year based on testing and feedback from thsi site. Take a look below.

http://www.prorelease.com/xring.aspx