Then, multiply the damage from a single bullet by the ease of shooting an AR-15, which doesn’t kick. That’s why, says Rhee, a handgun wound might require only one surgery but an AR-15 bullet wound might require three to ten. A swath of stretched and torn tissue around the wound may die. The bullet from an AR-15 might miss the femoral artery in the leg, but cavitation may burst the artery anyway, causing death by blood loss. When a high-velocity bullet pierces the body, human tissues ripples as well-but much more violently. When you trail your fingers through water, the water ripples and curls. These high-velocity bullets can damage flesh inches away from their path, either because they fragment or because they cause something called cavitation. While the rifle will function reliably and safely, accuracy will likely suffer.Īccuracy has a lot to do with the bullet touching the beginning of the rifling at a particular place (leade).If You Want to Stop Gun Violence, Start With Bullets Arrow 223 Remington cartridges in a 5.56-chambered rifle. Other designs may be able to use commercial. They designed these two chambers to handle both 5.56 NATO and. There are designs that address this problem, such as the Wylde and Armalite chambers. Instead, it is only required to be proof-tested to the lower SAAMI chamber pressure.īut all hope is not lost. It also does not require testing to Mil-Spec or NATO pressures. 223 Remington chamber is a “SAAMI chamber,” differentiating it from a Mil-Spec chamber.Ī SAMMI chamber may feature a shorter leade. Your gun needs to have a NATO or Mil-Spec chamber, which features a longer leade.įor those interested, leade is the distance between the mouth of the cartridge and the point where the rifling touches the bullet.Īnother name for the. What does all this mean to you? Quite simply, it means firing a 5.56mm NATO round through a gun not designed for that round can be problematic. This difference in the point of measurement can account for a difference in pressure measurement. NATO uses 5.56mm test barrels designed to measure chamber pressure at the case mouth, as opposed to the SAAMI location. Likewise, testing procedures are different. The NATO specification is also rated for a higher chamber pressure. 223 Remington cartridge (left) compared to a 5.56 NATO cartridge (right).223 Rem vs. In extreme cases, the over-pressure could damage or destroy the rifle and injure the operator.Ī. This over-pressure can cause difficult extraction, flowing brass or popped primers. 223 Remington chamber creates higher pressure. 223 Remington ammunition in a 5.56mm chambered gun, however, the same cannot be said in reverse.įiring 5.56x45mm ammo in a. 223 Remington is loaded to lower pressures and velocities compared to 5.56 NATO.ĭue to its lower pressure, you can safely fire. Pressure is the primary difference separating the. 224-inch diameter jacketed bullet, with weights ranging from roughly 40 to 90 grains (the 55-grain being the most popular). 223 Remington is a sporting cartridge with the same external dimensions as the 5.56x45mm NATO military cartridge. 223 Remington headstamp while the cartridge on the right is a 5.56 NATO round.223 vs. A quick way to tell the difference between cartridges is by checking the headstamp.
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