LAST EDITED ON Jul-07-17 AT 08:48 PM (MST)
After seeing your reply, I surfed a little more and found archerycalculator.com. I wanted to determine how much better the newer bows were at my shooting specs, or if it was just due to the higher draw weight. For whitetail, I currently shoot an old Champion bow at 60 pounds, resulting in 55 ft-lbs. (250 fps, 400 gr).
When I put my specs (29" draw, 60#) for a 320 IBO bow, speed was 275 fps (25 faster than mine, but 45 lower than rated), for a KE of 67. I just gotta decide if the 20% energy increase is really necessary. For muleys, no. For elk, I'm still thinking.
That 499 gr at 273 fps is pushing 82 ft-lbs! What bow are you shooting?