ORIGINAL: Doegirl75
I just put together some "bison" arrows. Total weight 678 grains with an FOC of 21% From my 82nd, 26.5" @ 54lbs I get aKE of 54lbs with a Momentum of 0.56.
Dr. Ed Ashby frequently used a 90lb longbow which generated .52-.57 momentum and a KE of 41-44lbs depending on the arrow being used. He did not seem to have any trouble taking down Cape Buffs and Asian Water Buffalo.
And yet people get in a tizzy when I tell them I plan on hunting a bison with my setup.
You have done your homework
I've seen the Ashby study / reports, I think they like to have a starting momentum of .5
Your rig does produce more momentum / KE than most traditional rigs.
I've blown through several (9 or more) whitetails with momentum of about .41 / 60# KE at launch (I even used mechanical heads).Those numbersdon't get much notice;people may not realize that's a 315-345 grain arrow at 293 fps.
My current set up(s) produce more "power" than I've had in the past.
The 430 grain arrow @ 273 fps = 71# KE / .52 momentum should be enough to make the heavy arrow advocates happy.
It's overkill for the whitetails I hope to shoot.