At this time of post I haven't read the 3rd page yet! From this forum and a couple of others I've seen the mention of SBD's. Now I've seen dies listed as AR type and now understand why................well not really why, just now know what SBD's are and for. Seeing many references to AR's (being semi) and not any like BAR's in mention and BAR's (or other semiauto non-AR's) might not need them? I go into this as I've reloaded countless numbers of rounds without using (or knowing I might have a die being used for this) FL dies in my setup? I FL every time I reload whether it be for every firearm (not including SG's as I don't reload them). BUT I have the die make contact with the shellholder by just a touch. Maybe this is why I don't have any issues when reloading for any of my cartridges in the AR platforms (5.56nato, 243win, 6.5gren, 6.5creed, 260rem, 6.8spc2, 300bo and 308win). I've also never measured fired cases and compared them to FL resized 1's. Maybe I will just to check on the possibilities of. I don't have any BA's with chambers of any that I have in AR's. Will I wear out my cases by FL sizing every time I reaload.................................well after more than 20 times using win super-x 264wm cases I have yet to have any issues using the same 100 cases over 38 years. On my sierra 140Spbt's I load with imr4831 over what their (sierra 5th I believe) states by .5 grain.