I did not shoot these bows through a chrono at the Bunny Hunt, But I can honestly tell you that they performed very well with my Axis 300 with 200 grns up front. Very impressive to say the least. As with any other invention, many will contradict, many will copy, most will not give recognition. It is what makes bowyers that push the envelope to keep driving forward. We are not talking of breaking the speed of sound, but trying to make the most efficient equipment available. Shoot what works and makes you happy, Just my 2 cents, Big Ed