I was just reading an article in the new North American Hunter October edition about how to determine whether or not you are flinching when you pull the trigger. Sometimes people will for some reason develop a habit of flinching in preparation of the recoil. They say this tip works best if you suspect it of another shooter and want to show them proof. Most people will not admit to flinching. Load the gun one round at a time for them and have them shoot each one. Then when they aren't looking after a few shots leave the chamber empty and hand the gun back to them. When they go to squeeze the trigger you will both know right away if they are flinching.