Yep the 223 is a good length & the M16 was built around it I guess.
The 222 Rem mag came out in 1958 & the 223 in 1964 if my googlefu is working today![]()
Back then the twist rates nobbled quite a few cases, the 244/6mm Remington springs to mind, just like most of the 22-250s today with a 1-14![]()
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