When I ordered mine I was also asked what components I would be using. After I started using mine I had some left over Federal primers ( mine was set for fiocchi) and tried to load. About every tenth primer would not be in the cup. Called Spolar and was advised that the loader is set for each primer type. Was told how to adjust for the Federal primers but decided to just load with the Fiocchi instead. The primer set is the only thing that might need adjustment. If I use Fiocchi primers, I can load any shell with no adjustments ( bushings of course). I've loaded over 14000 shells since last August with very few primer mishaps. Great loader!!