I have seen the numbers before but I don't recall where...isn't there an equation to figure out how much crimp you should put on a round i.e. how much a round should measure at the diameter of the neck after you apply the crimp? I think it had to do with the width of the brass at the neck but I don't recall the exact details. I am getting ready to set up my Lee FCD for 243 Win rounds going in a bolt rifle so I want to make sure I have everything as "perfect" as possible. If anyone knows I appreciate your sharing.