There is already the 20 Garin, the Garin cartridges are based the 30 carbine case - Cooper Firearms builds rifles chambered for them.

http://www.cartridgecollector.net/20-garin

http://www.saubier.com/forum/showthread.php?t=19121

https://pacifictoolandgauge.com/dvds-and-books/407-garin-sure-stirke-system-book.html

drover

223 Rem, my favorite cartridge - you can't argue with truckloads of dead PD's and gophers.

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