We all know that JCG's 10-shot T3E2 was designed in the .276 caliber that John Pederson invented as the ideal autoloader cartridge, but .30 caliber was mandated by Ordnance through Gen.MacArthur. To make the weight in that caliber, Garandcut the capacity down to eight. After WWII and with the benefit of 6 years of combat experience, the Brits investigated what the ideal military calibre should be... they found that it would be something around .280!