I've been working on a FS project for a couple of years now and since Hammerhead is a team sponsor (Redrum - redrumwoodsball.com) I've been able to do some testing. Nothing scientific, no slow motion video, just experience. Here's a vid of my last marker before Carmatech or Hammer 7 existed - First Strike Bolt Action Paintball Marker Demo - YouTube
. That is a Mofo 14" Hammerhead barrel inside the shroud with a 0.683 fin.
I just bought and received a 14" Battlestixx .684, 0.683 fin, and M-50 tip to use on my new Hammer 7. Initial backyard tests look good. I'll post up a video next week of factory vs Hammerhead barrel.