Trust, ...but verify!
OK, the Dillon 550 press came from the factory with a small powder bar installed in the powder measure and a large primer shuttle installed in the press which caused a lot of confusion for me in the initial set up.
Maybe they assumed everyone started with 45 ACP or 45 Colt.
I've marked the primer shuttle with a felt tip pen and l can recognize the small powder bar because of its size compared to the large bar.
Always trust, but verify!