There is some good advice here. Try for 20 and under, but be ready to know your limits when needed. If you are limited to 30-40 yards, or even 20 for that matter, you still stand a good chance at getting an animal. I have never shot an animal over 20 yrds with my bow, but I have been with and witnessed a few guys take animals up to 50 yards. The animal that poses the longest yardage in my opinion is late season mule deer. You usually find yourself being watched be a large group of does, while you are trying to get the buck that is constantly on the move tending them. I have got right up on early season mule deer and took one at 10 yards. He didn't even know that I was there. For the most part though, long range shooting is not required out west. Knowing the animal that you hunt will play a far bigger role in a successful harvest than will long range shooting. Every animal has its weakness, if you learn their weaknesses, you will put meat in the freezer more often than not.