fwiw ....
a noted south african ph, dennis kamstra, who also writes for the traditional bowhunter magazine, published his following opinions, which i think are quite apropos to this thread's aim and content ...
"I would like to make a controversial comment about bow weight and arrow weight for hunting big game. What I interpret to be "big game" is any animal over 250 pounds in live weight (because bone muscle mass is a much bigger consideration than with animals less than this weight). I will make a bold statement that for hunting big game, a bowhunter should be using a bow over 55# of draw weight and an arrow over 600 grains total arrow weight. Admittedly, this comment is based on my experience hunting African game, but I would throw elk, moose, bear, and big hogs in this category as well.
As long as I have put my toe into this controversial water, I may as well jump in all the way. The above recommendations are especially true for bowhunters using traditional equipment. I am in a unique position where I guide both compound and traditional bowhunters. My observation is that complete pass through is common with compound shooters, but rare with traditional shooters (shooting equipment lighter than my above recommendation). Once traditional bows get up to 65# or more, and arrow weight exceeds 750 grains, the difference in penetration levels out. In fact, I personally know outfitters who refuse to guide traditional bowhunters because of their experience with excessive wounding of game. I try to explain that this is a misconception, but my words have fallen on deaf ears. I think we, as traditional bowhunters, can alter this thinking by ratcheting up arrow weight specifically. But, in order to successfully shoot heavier arrows, we should have a corresponding increase in bow weight. I am absolutely convinced that heavy, FOC arrows are a superior hunting weapon. If nothing else, simply strive to use broadheads that exceed 190 grains in weight and match the rest of your equipment to that."