Iuse the Muzzy 4 blades 100gr and use the practice blades instead of field tips all year long. Practice blades fly the same for me out to 50 yards. I was the practice blades simply becuase they seem to fly more like the regular broadheads then my fielpoints. They do tear your target, but I have noticed they do not get the penetration on my Rhinehart target that fieldpoints and sharp broadheads get. I do test with the razors as the season nears.