Measured it? Not really. It should be around 18mm, and just a
touch fatter than 9x19.
I've certainly cursed it quietly a few times when loading 9mm.
It will make it clear through the process, only to be found when
case gaging ammo for a match. I can feel the .380's as
different in the sizing die---but not the Makarov.
It's a minor issue--not nearly as curse worthy as small primer