I'm just now starting to reload for 5.56 x 45 and am curious what crimp everyone prefers. During my research I found that it seems you can either put a slight roll crimp or use a Lee factory crimp. I am leaning towards using the Lee crimp but I was wondering if the crimp messes up your brass for future reloads? I will be shooting these reloads in an AR 15. So can someone explain the Lee factory crimp device? Thanks