I shot some over the chronograph and found my average velocity to be 156fps. This is shooting a 12.5mm (0.50") steel ball weighing about 135gr. with straight cut flat bands purchased from Amazon. They are 23mm wide x 0.65mm thick and I have adjusted them so I have about 7.5" of slack. My draw length is about 27" and the bands are set up shooting OTT on a 3D printed frame. I came to this set up after experimenting with different ammo sizes and band length and I can shoot comfortably without any handslap. Accuracy seems pretty good with me being able to hit a 3" diameter ball on a string about 60% of the time. Question is, is 156fps too slow? I don't have any plans to be shooting competitively, but small game hunting may be in the future if I can attain a level of accuracy to be good enough come this fall.