Rick I shoot the Seriess 22 Ultralight Pro's both for 3-D and hunting, my setup is a Bowtech BlackKnight 29" 62 lbs, the arrow is 29" with nock adapters and an 85 gr point for a total weight of approx 350 gr. Chrono speed is 289 fps. The shaft is a very stiff shaft and I am definately at the top of what I would want for spine but it tunes well and drives tacks for accuracy. As far as hunting goes last season was my first shooting this arrow, I managed to take a coyote and a nice buck but dont count on reusing the arrows like you would a thick walled shafted arrow. The coyote arrow broke after a pass though, another arrow I had shot at a fox and missed broke when entering the ground I realize this is a small sample but I dont think they are the most durable hunting arrow. As an all around arrow they are pretty good, as a 3D shaft I love them. Maybe we will hear from others. This is the buck I took with a Series 22 and a 85 gr Stinger.