![]() Your gun will not kaboom from it, but your expensive oprod, will wear out a lot faster and potentially bend.Ĭhamber pressures should be equal, it’s just that heavy pills with slower burning powders will burn longer and the bullet will accelerate slower, so the pressure is higher towards the gasport as a result. Not a safety issue, but if you shoot a 308, with a heavy pill (and slow powder) it will cause higher pressures at the gasport, and for instance in an M14 it will cause a more violent movement of the Oprod. There is only one “but” and that has to do with some semi automatics Even so, I try to always buy 5.56 NATO barrels. In my experience, after years of not caring and firing both through either barrel, I get the feeling that in the end it really doesn’t matter. ![]() But again, longer throat can lead to concentricity issues. I believe it also has a longer throat than either spec, which means that you can use longer bullets than anything else. 223 Wylde chamber that is used in most National Match AR-15 rifles is designed to combine the best of both specifications and work for either caliber. 223 Remington ammunition won’t be as accurate. But due to the different throat length, the. 223 Remington ammo is safe to fire through a 5.56 NATO gun, but not necessarily the other way around. 223 Remington pressures.ĭue to the difference in throat length and chamber pressure, the conventional wisdom is that. Nevertheless, the common belief is that 5.56 NATO pressures are higher than. However, due to the way in which those chamber pressures are measured (NATO measures at the throat, SAAMI does not) the pressures aren’t exactly the same. The NATO maximum chamber pressure is 12% higher than the SAAMI. Speaking of chamber pressure, that’s the other thing that changed. But if you try to load a longer bullet, the short throat length will push the bullet further into the case which increases chamber pressure and can lead to explosions and other bad things. That’s a bad thing, and negatively impacts accuracy.Ī shorter throat length means lighter bullets are more accurate. But with lighter bullets, a longer throat means that the bullet will not engage the rifling as quickly as desired and may lead to concentricity errors as the bullet wobbles off center before hitting the rifling. In the above image the throat length is clearly identified as the green markings on the bullet and marked as (a) on the barrel.Ī longer throat length will allow you to load a heavier bullet (since length is the only way to increase weight with a fixed diameter projectile and using the same materials), which are more accurate at long distances and such. ![]() “Throat length” is defined as the distance between the end of the cartridge neck and the point at which the rifling in the barrel engages the bullet. 223 Rem and 5.56 NATO are that the throat length is longer and the chamber pressure is measured differently. 223 Remington cartridge was already in civilian use and registered with the civilian specification authority ( SAAMI), it was stuck and wasn’t able to be changed to match the military specification when it came out. Then the military took it and jimmied the specifications a little further to make it suit their needs. 222 Remington cartridge tweaked to work in the AR-15 design. 223 Remington cartridge which was a version of the. Unfortunately, thanks to the military there are two different standards for the AR-15’s standard cartridge. It was a nice Cav Arms lower too.Īnyway, in order to keep everyone on the same page and make sure that the parts can handle the load, manufacturers use a set of common specifications. If the pressure in the chamber exceeds the design limits, the parts can shear or rupture. But the most important of these specifications is the maximum chamber pressure metric.īarrels, bolts and other components are designed to contain the pressure from the expanding gasses in the cartridge as the gun goes off, but they are only designed to withstand a certain level of force. All ammunition is produced to a given specification, which describes everything from the case dimensions to how far the bullet needs to be seated in the case neck.
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