If tou shoot all lead rounds 1/2" plate works great, but jacketed rounds will go through. The only options is the rifle rated steal ( ar 500) . The fab shop that i work at had a couple guys come in and wanted a price on 2 sheets, at my cost of 483.00 bucks a sheet my cost. They quickly decided against it. I used to make all the targets for the range where i shot cowboy action. With all lead rounds 1/2" or even 3/8" plate works fine. But with jacketed it will go through or richochet, witch can be dangerous.