what is the difference between .223 and 5.56 ammo – APHEX GUN STORE

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- Federal XM193 5.56x45mm 55 GR FMJ 500 Rounds
- $400.99
- Caliber: 5.56 NATO Bullet Weight: 55 gr Muzzle Energy: 1224 ft lbs Muzzle Velocity: 3165 fps Rounds Per Box: 20 Boxes Per Case: 25 Application: Target Casing Material: Brass
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