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flatlander · July 1, 1999, 08:56 AM

Remington developed the 223 for the military, and during the developmental stage, there were experiments with the 222 and 222 Magnum cartridges. To avoid confunsion(helped a bunch, didn't it?) when they finalized the case dimensions for the 5.56 round, they named it the 223. 5.56 is the bore diameter, while groove diameter is 5.7mm.

July 1, 1999, 08:56 AM	#6
flatlander Senior Member Join Date: June 16, 1999 Posts: 120	Remington developed the 223 for the military, and during the developmental stage, there were experiments with the 222 and 222 Magnum cartridges. To avoid confunsion(helped a bunch, didn't it?) when they finalized the case dimensions for the 5.56 round, they named it the 223. 5.56 is the bore diameter, while groove diameter is 5.7mm.