Question as I can't find my longbows IBO (it's 50lb @ 28", 72" tall, and the old Medieval Huntsman Longbow from 3Rivers if anyone could even take a rough guess). Technically, these arrows are 11.7 GPI. Is that too heavy for hunting, or no? The arrow seems to fly like a bolt of lightning but without the IBO I am getting numbers from calculators that say it's onl 80fps and there is no way that is right as in that video I shared I am at roughly ten yards and even at that super slow speed you hear the arrow hit the target less than a second after release. I don't have access to a chronograph which sucks.