Originally posted by Daddy Bear: I have a hand written note on "Ashby's Threshold" based on 14.8pounds-feet/second of momentum. The math and the logic behind the math makes me cross eyed, but I keep it as a rough guideline for elk.weight grains- feet per second450- 231500- 208550- 189600- 173650- 160700- 149750- 139800- 130later,Daddy Bear