Shooting water balloon (with no water) is great practice.blow them up to about the size of a small orange. I use some fishing line and hang it from the ceiling in the garage. The wind will blow it around pretty good if there is no wind i turn a fan on. I can hit them most of the time at 30 yards,if not poped it gets bumped out of the way (with field tips) broadheads will pop the balloon with the slightest touch.
My next Challenge is ground hog. land owner needs to get the population under control. So for I have taken out 8 and the longest shoot was at 27 yds. they are real good practice for moving slowly and getting the yardage right.