Just curious if you've ever picked up any LC "once fired" .308 from Midway? I had the same opinion until I tried to process a batch of that stuff. W/O a SB die that stuff would NOT chamber in my Savage 10FLP . .the machine guns that stuff had been fired in was definately not friendly to just regular FL sizing.
This is the one exception (Mainly MG-fired brass) that I believe I alluded to in my post. If you plan to shoot this stuff, an SB die is called for- but only once.