Why is .30 cal so popular with rifle cartridges (.308, .300 WM etc.) but not common at all with pistol cartridges?
The closest thing we have is .32 but that caliber hasn't seen any love for decades and its most popular representative, .32 ACP, is in a coma and about to flatline because it's gotten so brutally eclipsed by subcompact .380s.
Also, .30 supperfaggy (not a .30 cal either) and 7.5 brapno are already gay and dead before they even left infancy.
I find it impossible to believe that no one ever tried reviving the .30 Luger with modern pressures and powders. A modern .30 Luger would shit on 9mm balistically.