I'm about to start loading for my 7mm Rem. mag. What I need to know is since I will be purchasing a set of bushing dies, what is the most common sized bushing used? I have never fired the rifle, therefore I have no cases to measure for myself. I figured you guys could save me alot of footwork. I'm after about .001 or .002 in neck tension. But will likely purchase several sizes. Thanks guys..