The going number on this sight is 1000ft lbs or 1600fps.
Then how does one kill a Deer with a 45 ACP? the 45 ACP kills them very dead very quickly BT/DT. How does one kill a Deer with a Bow and Arrow since it take a rather heavy draw compound to reach 80 foot pounds?
Not getting in to this one due to many different variables to each. I saw Ted Nugent shoot a deer at 100yrds with a 10mm. It ran away. He stalked it and shot it 3 more times up close and it still ran..
Very little "thermal" energy is transferred in the impact of a bullet on flesh and bone. Most of the enrgy is transferred in the deforming of the bullet and producing permenant and temporary wound channel.
I dont look at energy for deciding how far or what to use for killing deer/elk or whatever. I look at the bullet's construction and designed performance and impact velocity.
What the heck were they or he aiming at? The anlters? Just kidding but on a serious note I have never put more than one bullet in a whitetail. This was using caliber from .204(I know laugh all you want)to 7rm. However I have a ? to you on the 180 bullet that was used? Was it by chane a swift scirocco? I witnessed an elk and mule deer get shot this year and both took multiple shots(elk took 6!)(mule deer took 4!) The elk was a 480 and the deer at 150. I am not convinced on these bullets and after that hunt I think I got my buddy convinced to change to a different bullet.I saw a Deer shot 3 times with a 300 Ultra Mag and was still running it took a fourth shot to anchor him for good. The load was a 180 grain at 3314 FPS for 4389 foot pounds of energy. Not sure what your point is.
Ted also killed a Cape Buffalo with the 10mm. Foot pounds of energy is not the way to rate wound trauma incapacitation.