223 Remington chamber may produce pressures in excess of even the 5.56 specifications due to the shorter throat. 223 Remington ammunition can be safely fired in a rifle chambered for 5.56×45mm NATO, firing 5.56 ammunition in a. This has resulted in a lengthening of the throat in the 5.56 chamber. The 5.56 chamber specification has also changed since its adoption, as the current military loading (NATO SS-109 or US M855) uses longer, heavier bullets than the original loading. 223 Remington, and the methods for measuring pressures differ between NATO and SAAMI. Average Velocity (fps): 1,041 SD: 21 ES: 57 Best Group (in.). 223 Remington, FMJ, 62 Grain, 20 Rounds Buyers Club 12.82 Non-Member 13.49 Was 15.49 4.8 (21) Add to Cart On Sale Fiocchi Rifle Shooting Dynamics. Best of all, Remington offers its Subsonic loads for just 7 cents a round. 223 Remington, 55 Grain, FMJ Ammo, 20 Rounds Buyers Club 9.49 Non-Member 9.99 4.6 (30) Add to Cart On Sale Hornady Black. The maximum and mean pressures for some varieties of the 5.56 (different cartridge designations have different standards) exceed the SAAMI maximum for the. Subsonic is also effective with a suppressor, so whether you’re shooting soda cans or prairie dogs, there’s no need to give yourself a headache. 223 Remington and 5.56×45mm differ in both maximum pressure and chamber shape. While the external case dimensions are very similar, the. This rifle ammunition is loaded with a 0.224-inch (5.7 mm) diameter jacketed bullet, with weights ranging from 40 to 90 grains though the most common loading by far is 55 grains. The name is commonly pronounced either two-two-three or two-twenty-three. ![]() 223 Remington is a cartridge with almost the same external dimensions as the 5.56×45mm NATO military cartridge.
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