Head Height Discussion

[stagpanther]

From the guns and ammo link:

The next variable that crops up is what I call “bullet seating head height length.” This is a measurement from the head of the cartridge case to a diameter on the ogive of the bullet.

In other words, his entry into "guess what head height is" contest is CBTO. That's at least 3 different definitions we have so far.

I'd like to make my own entry; I call the head of the case where it meets the main case body wall "head height."