Arthur,

Holt could very likely be using nib points and different fletchings (he does prefer feathers though) to get those weights.

And I' ve got to agree with Corey. All this mom. vs. KE is pretty much splitting hairs for North American game save perhapas a Bison, or Musk ox.

I see arthur' s point in limiting equipment by KE levels, and agree that' s a poor way to set regulations.

I think KE/Mom are only rough guidelines. I' ve had my low KE/low Momentum arrows zip through whitetails w/out a hitch, and I' ve had heavier, faster arrows hang up at the fletchs on the other side. Is drag taken into consideration? shaft diameter? blade sharpness?

Way too many variables in equipment, anatomy, and hunting situations to say X or Y is the defacto indicator of penetration value.

IMO, of course.