I just shot a 340 gr, 600 spine arrow out of 52 inch long 50 lb. at 25 inch draw bamboo lam bow ,and got 166 fps. With a 52 lb.sinew backed Black Locust same draw ,same arrow, same length bow at 170 fps. Now I have a much better idea of what it takes to post the numbers you guys are posting with 50 lb .self bows. Very impressive to say the least.