RE: How efective is bow on big game hunting?
Not sure where you are getting your info but you need a new source. Archery equipment can and does bring down the biggest and meanest animals this planet has to offer very effectively. Such as cape buffalo, brown bears, elephants. You do not need the latest and greatest compound to do it either. Many are taken each year with good old fashoned long bows and recurves.
No mater the size of the animal, if you place a broadhead tipped arrow through both lungs and / or the heart, the animal will have about ten to fifteen seconds to live. Many animals run less distance after being hit with an arrow than they do with a bullet while usually leaving a beter blood trail to folllow.
How far you shoot depends on the individual and the circumstances sourounding the shot. There are many factors that can and do influence this. Such as how much you practice, at what diatances you practice regularly, how alert the animal is, what the animal is, how much energy your arrow is producing, etc...etc...