WINCHESTER 5.56 NATO (.308 Win) and the 5.56 NATO cartridge are the two most popular centerfire rifle cartridges in the United States and North America. Both cartridges are war-proven and currently in service with the US military and its NATO allies.
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WINCHESTER 5.56 NATO(often referred to as 5.56 NATO or 5.56) is an intermediate cartridge designed based on the .223 Remington. It was named because of NATO’s standard rifle cartridge design (North Atlantic Treaty Organization).
Can a 223 be fired from a 556 NATO chambered rifle?
223 of 55,000 psi will not be achieved, and therefore speed and performance will be lost. Problems occur when this combination is fired from a 5.56 NATO chambered rifle with a 14.5″ (or smaller) barrel.
| Brand | Winchester |
| Caliber | 5.56 Nato |
| Model | WM1931000 |
| Bullet Weight | 55 Grain |
| Bullet Type | Full Metal Jacket |
| Reloadable | No |
| Case Type | Brass |
| Rounds Per Case | 1000 Rounds |
| Boxes Per Case | Bulk Loose Case |
| Muzzle Energy | 1282 ft-lbs |
| Muzzle Velocity | 3240 fps |
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