ORIGINAL: LouisianaTomkat
500 grains is 500 grains, whether it is 1 mm wide arrow or 2" wide arrow.
You are kiddin' right? If an one arrow is wider than another, there is more surface mass (Not weight mass). If the same "weight" arrow has more "surface" mass it will take more KE for a pass thru.A smaller "surface" mass arrow, will out penetrate a larger "surface" mass arrow of the same weight every time. This, considering you do not have a 2" cutting surface trying to plow all the way thru a deer's body. I am speaking of using Fixed heads.
Sorta like trying to shove a greasy BB up a Bull's ass compared to shoving a bowling ball up same said Bull's ass. It will slide in a lot easier if it is smaller.
LT
Not kidding at all, mass has nothing to do with surface area or volume of the shaft. Mass is directly linked to weight, not volume.
Your point is sound, but it doesnt have anything at all to do with mass. 500 grns is 500 grns.
With a sharp object cutting a path before it too, I dont see this being a very crucial factor with BHs....with a fieldpoint, the narrower shaft will penetrate noticeably better.