I have used Grim Reapors the past 2 seasons, took 6 deer with them. I know someone will say that I could have done that with any head, and I agree. I am a former Muzzy shooter, and I took alot of deer with the Muzzys, but the penetration and wound channel with the GR's was better, IMO. I am not bashing Muzzy, just the GR seem to work better with my set up.