You can practice all day shooting off the ground at targets at any range and it is good for practice, but there is a whole new level of challenges when shooting at live animals out in the hunt. I practice out to 60 yards in my backyard but only want 30 yard maximum shots on the hunt.

When archers target shoot most of the times they know the range of the target. You will have to judge distance on deer and that can be difficult out in the field, especially on archery shots when a 10 yard misjudment can makes a difference between a hit or miss. Rangefinders and higher velocity bows have made this easier but there are other issues. Any limb can send your arrow/bolt way off its original trajectory. Shooting uphill or downhill can offer compensation challenges. Knowing you might wound an animal and lose it should always be a consideration so stay within your own limitations.