I wanted a smoken fast set up. I have shoot the 75 gr. heads for years. i used to shoot 85gr thunderheads but didn't like the way they fell apart so i went to the muzzys. I tried the 75gr. rocket expandables but the blades would open up go through the insert and dig into my arrow shaft, so i went back to fixed blades. they flew great out of my Ultra Force at about 302fps. and they only have a 1" cut which equals less drag/resistence in air and in deer.
I'll be at 5.2gr/pound