I just got in a new shaft from Arrow Dyanmic's. It's overall heavy in wt and spine. The bare shaft wt is 475 grns. I am not sure of the spine, I put in on my spine tester and it bottomed my tester out, somewhere at 130 lbs on 28" centers. I will get a more exact spine soon.
They are based on the Hammerhead series and have the same tapered design. The shafts are so new they don't even have a name yet. These will be great shooting from bows of 70+ lbs. If anyone is interested getting some, let me know. They will have the same price as the Hammerheads.