IMO, they are much harder to bend than aluminum arrows. I can't recall the exact specifics, but I know I was shooting at a target in my basement, and my target tipped over onto the ACC. I thought that was it for the arrow, but I spun the thing and it spun, then shot fine. I had another on that I shot through an aging bag target at the club, and it buried itself into a treated 2x4 that was part of the target frame. Again, I wiggled it back and forth until I could unscrew the arrow from the field point, and the arrow spun fine. No bend. Most of the ones I ruined were from other arrows dinging the sides of the arrows. I have sliced a few with Muzzy practice blades trying to see if broadheads were shooting close enough (and being too lazy to go pull each arrow.). You should be able to use a 5" feather fletched helical, but you will have to do some adjusting with your fletching jig to get it just right. My FOC with 28.5" arrows, 3-4" feathers and 100 gr. point was about 13% if I remember correctly. That is with an ACC 3-60.