I have used the cut on contacts for several years. One thing you need to remember is that cut on contact 2 blades with no bleeder blades have clean wound channels that can close easier(flap together), I experienced weaker than normal blood trails using this type. The penetration was awesome and each bull went down fast, but the blood trails were weak without the bleeder blades. I shoot around 80 ft pounds of ke so penetration is not an issue. I switched back to the muzzy heads because I wanted an extra wound channel for trailing purposes. If you are shooting a lower ke I wouldn't hesitate to suggest the cut on contact heads because they will give you the best penetration possible. IMO I beleive that a 3 blade cut on contact would be the best. As the wound flexes in any direction, it will open at least one wound channel giving you a trackable blood trail with great penetration.