I was wondering what you guys are using for steel targets for these big guns. I will soon be a owner of a 338AM and currently have a 300RUM. I want to get a piece steel that I want turn to swiss in a month. I assume a piece of ar500 will be my best bet but how thick do i need 5/8 3/4 1 in. I am sure it just depend on how far away it is and it will never be closer that 600 yard any info will be great thanks.