First get a good set of dial calibers so you get consistent readings if you going to use the Hornady system with bushings for headspace and OAL length at the ogive (comparator). I have used the Hornady, Sinclair, RCBS and Innovative Technologies tools and they all work. These are extremely useful when setting up FL dies for proper headspace and generally use a combination of them when doing so.
"Emergencies have always been the pretext on which the safeguards of individual liberty have been eroded" - F.A. Hayek