All the numbers and yards are generally speaking. I agree, a moving target at 50yds with a pistol is hard. My shooting buddies and I have a remote control monster truck that we re enforced with sheet metal. What we do is attach air filled balloons on a 2ft string and attempt to shoot the balloon. Its very hard!!!! I live on thr outskirts of town and my family shares a nice piece of land so fifty yds away for my kids isn't uncommon. All situations are far fetched but its just to spark the what I want to have thought process. I know most justifiable cases are within 15ft. But somethings occur that are uncommon.