Gentlemen, When I started loading for my 6x47L, i bought some muli-times fired brass, used. That turned out to be a mistake. But, what it did do for me was to give me some already formed brass to shoot out of my rifle. Now to my point here... Those rounds gave me a few cases fired in my rifle. So, when I finally found the 2 stage forming process I now use exclusively, I had cases that I could measure to set my FL sizer with. Like many I try to only set shoulders back approximately 0.002- 0.003", when FL sizing. So to answer others questions, I would hesitate to screw my FL sizer all the way down to shell holder , unless needed... Good Luck folks!!!!!!! Idaho-45