As you are learning, it depends, 3/8 or 1/2” and plate size. A 10” or larger 1/2” will barely move. A 6” will move. Single strap moves more than a double strap. A 8” single strap will move when hit with 223. Lighter steel is better. Fresh paint helps so you can see hits vs marked up plates. Shoot the 6” plates if you can.