OK, I'm just getting my reloading bench set up. I have the all the basics to get started...rockchucker, Forster FL die and Forster seater. I will only be reloading for 7MM Mag to start. The instructions on the forster FL die says to screw the die down until it touches the shell holder then lock it down. Is this the recommended method? I think I want to head space off the shoulder, not the belt, correct?