6/13/2023 0 Comments 5.8x42mm vs 5.56x45In the 5.56 test barrel, the XM-193 produced 48,000 PSI. I had them test it for pressure in two laboratory barrels - one chambered in 5.56, and the other in. No big secret, the ammo was a batch of Federal XM-193, 55-grain FMJ brown box. How much? To find out, I sent some 5.56 ammo off to a test lab. 223 with its shorter leade, you get a pressure spike. When you put 5.56×45 ammunition, meant to utilize a longer leade, into a chamber cut for the. The government is more interested in a rifle that keeps working, even if it means they have to accept a 3 MOA accuracy level, instead of a 2 MOA potential. In a really harsh environment, a scosh more room in the leade can keep a rifle running, where one with a tight leade (not a short leade, the two differ) would choke. This larger diameter is there less for pressure than function. Some 5.56 chamber drawings show a larger diameter in the leade proper than is in a. The rifle and cartridge designers did that deliberately to allow for a hotter load and higher velocities because the longer leade allows for more run-up to the engraving. This is 5.56 ammo, and you should not be using it in a rifle with a. Ammo companies know what they make, and they mark it accordingly. The 5.56 has a longer leade, a longer distance between the bullet start and the onset of the rifling. 223 Remington and 5.56×45 are not the same. If it is newer than M855 (the mid-1980s) and it is military, you can be sure it is 5.56 and should be treated accordingly.
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