Ammunition & Hand Loading > General Ammunition Discussion
.223 Remington vs 5.56 Mil.
Clint:
I really thought they were the same rounds. I have an old mini-14 that I have shot both rounds through. I see the newer ones are OK, but I need to dig mine out and see if it is really chambered for both like the newer ones are. They are SO dang close...
FarmerRick:
Physically, the brass is a little different too, as 5.56 usually has thicker walls near the base.
Another good chart:
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