ORIGINAL: Slow Burn
I am missing something here. This thread went from .222 and .223 to .243 thru .30 06? Hmmmmmmm. I also must have missed that day in class when we were covering the 1000 and 1500 foot pounds of energy needed to efficiently harvest animals. I wonder how much energy a compound bow generates? Is that weapon capable of efficiently killing a animal? Who developed these rules on bullet energy and where are they published?
Here's one source. Peterson's Hunting Magazine.
http://www.huntingmag.com/guns_loads/all_012505/
I suspect if you try google, you could find a lot more.
Arrows kill in a different way than bullets. Less about energy transfer, more about slicing and dicing. And, I would argue that it's not nearly as "efficient."