There is a winners choice string. I had it put on by Humphrey's Archery in American Fork Utah. (Ask for Brian). Why are you so interested in keeping your fps above 310? I would recommend you weight down your broad head and arrow shaft so you bring the arrow to a much more controlable and predictable speed. There is no doubt that when I shot my xforce at 330 fps at only est. 67 lbs of draw that I was impressed by the bow and bought it shortly after. However, I decided to bring down my speed and exchange the energy for kenitic energy. Last calculated I have 94 lbs of kenetic energy that would probably blow clean through a decent sized bull elk. Let me know what you decide to do. Good choice on the bow and good luck with the strings. If you get them put on by Jake's archery (Provo or Orem Utah, they might have them in stock. Otherwise it will be a 2 or 3 week wait. Let me know what happens.
-Aaron
