I'm not sure if this is the right section or not, but it's a pistol caliber.
I was flipping through a pamphlet from Winchester, most likely came with a gun my grandfather bought, that was from 1980. I was looking at a chart of centerfire pistol ammo they had out at the time and saw 9mm Win Mag on the list. I was curious if that was just another name for 9x23 Winchester or not? Also, why you don't really hear much about that round?