Using dummy rounds is a great way to learn how to clear malfunctions and also to work on trigger control! What I have found to be a very effective way of improving a shooters skill is to mix live and dummy rounds in a magazine and insert it in the firearm, then have the shooter go through a course of fire that requires them to shoot, and clear any malfunctions caused by the dummy rounds.
When the shooter squeezes the trigger on a dummy round, the firearm should not move at all! It should be steady and not “jerking” down. If it does jerk down the shooter is anticipating the recoil and causes the rounds to go low. Also, commonly called flinching.
After working dummy drills for a while, then try a full good live magazine and see if the shooters accuracy and handling has improved.
The shooter above as you can see and hear by the “click” has dummy rounds, the firearm does not move, he taps the bottom of the magazine, step one in clearing a malfunction is to make sure the magazine is seated properly), then he tilts the firearm to the right a bit and cycles the slide to remove the bad round. Tilting it to the right a bit allows gravity to assist in the round coming out in case the extractor had not engaged the case., then back on target and another squeeze of the trigger. This shooter has very good steady trigger control and malfunction clearing.