Work real hard to become a great shot and twice as hard to be a great hunter! Knowing your limitations and knowing the disposition of the animal at the time of the shot is every thing.Size of the animal (meaning size of kill zone),angle of the shot,your own temperment at the time,calm and steady,cold and shaky.All these things enter in to the equation.
95% of my practicing takes place at 50 yards.I much prefer hunting shots that are 30 yards and in.I have shot two bucks at approaching 40 yards,one was a perfect shot and the other the buck took a step as I shot and I ended up hitting way back,fortunately I hit a main artery and he didn't go 15 yards.
To those that can consistently kill game at the longer distances my hat goes off to them. I also have a close friend who is an exceptional archer,and he his so confidant in his ability that he has taken shots that he really shouldn't have.Like the strong armed quarterback who always thinks he can thread the needle.Instead of the interception or incomplete pass with us it is wounding game.We owe it to the animal to stay within our capabilities.