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[–] kalergisplan 0 points 5 points (+5|-0) ago 

Are those .223 rounds? I think he was over 400 yards away so probably not the best choice for ammo.

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[–] Spectral 1 point 4 points (+5|-1) ago 

Most likely 5.56 rounds.

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[–] AynRandPaulRyan 0 points 3 points (+3|-0) ago 

.223/5.56 is combat effective to about 600 yards. Definitely not ideal, but M855 is still trucking along at 1500fps at that range, and hits with about 310ft/lbs. That's comparable to a 9mm pistol at the muzzle.

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[–] GeorgeLRockwell 0 points 2 points (+2|-0) ago 

They look very similar.

https://i.imgtc.com/KVWevjD.jpg

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[–] wifblat 0 points 2 points (+2|-0) ago 

The outer dimensions are identical between them. The pressure is the real difference.

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[–] OneTrueCube 0 points 1 point (+1|-0) ago 

Extremely stupid question; would one be able to use these interchangably, since they appear to have identical dimensions?

In other words, is a rifle chambered for 223 able to fire 5.56 and vice versa?

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[–] jervybingly ago 

Very good point, my man. You need a few hundred ups.