I am glad to see some brought up the fact that down range everyone losses fps & KE. My brother shoots a Legacy, 64 lbs, 28” draw & ACC 3-49’s. He is getting 255 fps & 57 lbs of KE off the rest, but @ 40 yards he is just @ 44 lbs of KE & 228 fps. You could get into a situation where shooting mech. heads may keep you from taking a longer shot.
If you ask, people are saying that you need anywhere from 40-50 lbs of KE to open a mech. head correctly. My brother will not take that longer shot unless the deer is perfectly broadside.
If you want to play with numbers, & figures, get the Archery Program, I have found it to be quite accurate with speeds, a little too much on arrow drop, (probably more my shooting). <img src=icon_smile_evil.gif border=0 align=middle>
http://www.thearcheryprogram.com/
Good judgment comes from years of bad judgment.