Final formula for obtaining the Hunting Energy Units on Air Rifles.

I am very interested to see if any update has been made to this formula,also,im wondering, what is HEU?
No updates, just empirical on field confirmation exercises.

Main exercise was an autopsy to a white tailed deer taken with .30 Cal vs. Previous taken with .357....

Irrespespecrive of fpe (that were close) damage with .357 is easily two times, much more, with the .357..... So, the exercise of getting the HEU's is not irrelevant.