Most of the primers I've used had the anvil legs protrude slightly beyond the cup. The anvil will slightly crush (preload) the priming compound when the cup is seated properly. So are you measuring the total thickness of the primer, anvil legs to cup face, or just the cups? Since the anvil protrusion probably isn't a precision measurement, you won't get reliable measurements of overall height...
First post states .243 Win brass being primed, now 45-70?
My Anchor is holding fast!