by flintlok » Sun Feb 11, 2018 4:57 am
The 223 (5.56) NATO round was developed from the Remington 222. Other a higher velocity due a slightly longer case in the 223 there's not much difference in the physical dimensions. They both shoot the same exact projectiles and they are all .224 inch diameter. There's only a couple 100 fps muzzle velocity difference between them and often much less. With a 55 grain load the near identical.
The faster I go, the older I get.
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