But also note while his tests compare arrow weight and velocity, that arrow diameter & differing material is not used as testing factor (all tests were done with "22XX" alums).
I think that was his intent of this testing was to eliminate those variables- strictly concentrating on KE and momentum for a given material.
And to me, the problem with doing test of "real hunting situations" is that there is very little, if any, consistency to the impact material. How do you get consistent material from an animal body to shoot shot after shot into for testing? Even if your 1/2" off from where the first shot went, who knows what sort of density differences you may encounter in an animal's body. I suppose if you had enough time and animal bodies to use, you could do lots of "averaging" to get some credible results.