i was just on bowjacksons website trying to figure out the energy on my arrow and everyone always told me that the hca speed pro arrows would not have enough energy well when i figured my 350 gr arrow at 280fps i came up with 61lbs and when i i figured my speed pro 300gr arrow at 315fps i got 66lbs so now i'm confused everyone was telling me that the speed pros would not have enough energy to hunt with but it looks like its putting out more energy than my carbon express 300cx so now i'm really confused cause i like the speed of the speed pros cause i have a short draw length can someone please help explain this to me. thanks alot