Okay I've got a 2010 Martin Pantera 55-70# limbs and it's set at a 30" DL...also I've got the DW set at 55#. I recently sent this bow to Mike Carter for tuning and a new string set. The arrow I sent along for tuning was a Easton Excel ST 340 with a 100 gr tip...total weight at 29" shaft length was 394 gr. He told me he chrono'ed my bow at 280 fps with my 394 gr arrow...this is with the bow set at 70# 30" DL...I know I could go with a lighter arrow, but arrow speed is not really my main concern. So, I purchased some Victory X-Ringer HV 350 V1...cut the shafts at 29" with 75 gr tips, my total weight is 327 gr. I also, purchased an arrow radarchron...I've read good and bad about these instruments and their accuracy. So with my Martin Pantera set at 55# and DL at 30" and my new X-Ringers total weight of 327 gr..I shot 10 arrows...my readings were 359 fps to 362 fps. This bow is really a sweet shooting bow...but I was wondering if my readings are where they should be or if there's something I'm missing?...I think the IBO is 315-320 at 70# and 30" DL. Any input would greatly be appreciated...I know this isn't considered a speed bow, but i was hoping for something alittle closer to 300 fps.