The 650 happens to be the only machine you can visibly check easily from the factory. Just keep your eye on the primer disk, IME there is always one after the other, every time, all the time, no matter what. Unless you have emptied out the system and just started loading.
If that is the case, this is why the station #2 retainer is spring loaded. After you have sized a case and it is at #2, slightly raise the ram and manually index the primer index by hand until there is a primer on top of the punch, reinstall the case and get to loading.