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7,92x33 necked down to 30 caliber
There was an ill-fated attempt years ago to convert the M1 carbine to fire the 30 cal Kurz cartridge. Believe it was around the late 60's or early 70's ? Anyway it used a new longer barrel and modified slide, bolt face opened-up too. The 30 Kurz would fit in the carbine magazine using 110 gr bullets.
Could not generate any following and it was just too unsafe.
Here is a photo of the 22 K-Hornet next to the 30 Kurz cartridge (supplied Cartridges of the World with my 30 Kurz cartridge photo years ago)