![]() 223 Remington chamber may produce pressures in excess of even the 5.56 specifications due to the shorter throat. And that’s not even the loudest gunshot Powerful centerfire ammunition can exceed 165 dB. 223 Remington ammunition can be safely fired in a rifle chambered for 5.56×45mm NATO, firing 5.56 ammunition in a. How Many Decibels is a Gunshot How loud a gunshot is in decibels will depend on the gun and the ammunition. ![]() This has resulted in a lengthening of the throat in the 5.56 chamber. ![]() Agree with the bolt action 300BLK is way quieter than an AR 300BLK, still not. Its still way overpriced IMHO, I thought that by now it would come down but so far its still crazy high. 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. Biggest drawback of the 300BLK is the ammo cost, especially the subsonic. 223 Remington, and the methods for measuring pressures differ between NATO and SAAMI. The maximum and mean pressures for some varieties of the 5.56 (different cartridge designations have different standards) exceed the SAAMI maximum for the. 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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