The seating die. The FCD is not in the picture with this situation at all.
I set the seating die body with a case that measured 1.760 - sammi max.
All my brass is trimmed to 1.755, or a little less (after trimming, they measure between 1.755 and 1.748-ish). Some brass is even shorter; and I just VLD chamfered them. I measure and trim as needed after every shooting.
Anyway, I screwed down the seating die body until it just touched the 1.760 case, and stopped, and locked it down. Next time I load, I'll double check it.