I've been shooting alot of HCA bows at extreme speeds & yet to have one problem. (mostly for demonstraions ) people really want to see the bows at these speeds. & the first thing they say is that bow is quiet & 2nd is how fast was that .
I set most of my bow a 60 t0 65# for a very nice shooting set up.
thanks for the concern. the way I look at it, why pull 70#s when you can achieve the same result at 60#s & that is what this arrow will do
Gregg