I used alot of different carbons over the yesrs that I sot 3D and a buddy just gave me a half dozen Easto Hyper speed 2-39/470 which weighed in just alittle over 325. and they shot great out of my bow, which is a ancient bow(made in the late 80s Martin pro safari) and I was gitting 287fps at 60 pounds at a 28 inch draw with them. I was shooting them through the conograph after I set my bow up, then paper tuned them. and got another 4fps so all together 291fps.I just called my local achery shop tonight and he said if I want to stay with basicly the same arrow he diffently pushed the Easton Lightspeed on me. He had used them for a while and loves them.So that is my2 cents worth. But I deffently a beliverin asking alot of question and talking notes, dont be afraid to ask at your local shop and talk to all the people that hang out there.