RE: what is a good guess on my bow speed?
shoot it thru a chrono that is the only way to tell how fast the arrow is traveling.
if you know the arrows total grain weight the IBO speed at 30" 70 pound you can subtract 10 to 11 fps for every inch reduction in draw length and subtract aproximatelt 2 FPS for every pound then subtract about 2 fps for every 5 GN over 350 for the weight of the arrow that is only aproximate calculation