[rmlew]

The 5.56 NATO round is not a .223 . It has a bigger charge and is higher velocity.

[Frohickey]

The 5.56 NATO round is not a .223 . It has a bigger charge and is higher velocity.

You are wrong!

5.56NATO is 223Remington.

Military brass maybe a bit different from commercial brass in that its thicker, but the external dimensions are identical. Military brass, because its thicker, might have less case capacity. If you put the same amount of powder into less case capacity, you get higher pressures and higher velocity. But that is not necessarily a safe thing to do.

[ninenot]

SEE POST #97. I rest my case.

Actually, there's some confusion about the .223--in the sniper threads, people stated that the .22-250 is the same as a .223, that 'there are many rounds which are .223,' etc.

I don't believe that is the case. The .22-250 is truly a varmint round, as is the 6mm (.243.) But the .223 is strictly used for killing people. 140 grains at 3000+fps, frag round after impact.