I'm 29" @ 63# this season, last season I shot 72#, both are great arrows. I've shot 400 and 340 FMJ in the past and had no problems. Last year I wanted to try the high FOC thing so I went to the Gold Tip pierce platinum's in 300 spine and I'm running Ethics Archery stainless steel inserts and collar for a total arrow weight of 560 grains and 22% FOC. I'm shooting this same set up again this season. They shoot great out to 60 yards, haven't shot them past that range but I have no dout that they will perform just as good at longer distances. I would suggest taking your bow into a reputable archery shop and go through the tuning process with what ever you got with.