Once again, caliber versus cartridge?
I own .380 and 9mm--same caliber, different cartridge.
I own .38 and .357, but they use the same caliber bullet.
Likewise, I own .45 acp, .45 Super and .45LC, all the same caliber, but different cartridges.
Yes, I hand load, so the distinction is valid.
So: excluding .22LR, three calibers. Seven cartridges.
Oops, almost forgot .41 Mag. Make that four calibers, eight cartridges...