![]() While the external case dimensions are very similar, the. 223 Remington and 5.56×45mm differ in both maximum pressure and chamber shape. The maximum and mean pressures for some varieties of the 5.56 (different cartridge designations have different standards) exceed the SAAMI maximum for the. The 75 grain Sierra HP flat base is a much shorter bullet than a similar weight BTHP bullet, or a 100+ grain SP or HP bullet. 223 Remington, and the methods for measuring pressures differ between NATO and SAAMI. This allows the 75 grain HP flat base to be more stable and have the potential to be more accurate at subsonic speeds than a BTHP design that makes the bullet longer, requiring more twist rate to stabilize it. 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. This has resulted in a lengthening of the throat in the 5.56 chamber. 223 Remington 75 gr BTHP Match Hornady BLACK. Hornady BLACK ammunition features versatile loads optimized for excellent performance from America’s favorite guns.Ģ23 Remington ammunition can be safely fired in a rifle chambered for 5.56×45mm NATO, firing 5.56 ammunition in a. This is the best subsonic rifle round ive had the pleasure of testing, using a suppressor it is absolutely. Loaded with legendary Hornady bullets, Hornady BLACK ammunition is designed to fit, feed and function in a variety of platforms. ![]()
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