I have recently carved out a shooting range on my property. Shooting into the back of a 100 feet tall hill with no neighbors so it is very safe. Looking for advice on shooting distances and steel targets to get after my "tree stump" is shot away. I plan to saw the stump to the ground and use it for a base, 3 feet around. Before we just went out and shot, no actual measured distances. Will be shooting 9mm and .45, and 38 Special revolvers. Thanks...