I just got a new bow and am trying to decide what weight broadhead to use. I want to try the Muzzy. I am shooting a Cybertec at 63#, GT5575 at 28 1/2 ". I know I may have to experiment but am looking for a good a starting point. I shot a couple of 125 Tunderheads. And while they shot ok It looked as if the arrow was flexing as it went down range.