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The M855A1 bullet has a 1 ⁄ 8 in (3.2 mm) greater length than the SS109/M855. [141] Because steel and copper are less dense than lead, the bullet is lengthened inside the case to achieve the same weight as its predecessor. [10] The longer bullet and reverse-drawn jacket make it more stable and accurate in-flight.
The table below gives a list of firearms that can fire the 5.56×45mm NATO cartridge, first developed and used in the late 1970s for the M16 rifle, which to date, is the most widely produced weapon in this caliber. [1]
.22 long, a cartridge predating the .22 LR, with the same case length using the lighter .22 short bullet.22 long rifle (LR), the most common cartridge type of this caliber, often referred to simply as ".22 caliber" or "22"
The neck is sized for .224 caliber bullets. 25-45 Sharps : Uses the standard military 5.56x45 case (also .223 cases), the neck is simply expanded to .257" 6.5mm Grendel :The Grendel uses the same head and rim from the .220 Russian and the 7.62x39 with a rim diameter of 0.441-0.449. The 6.5 Grendel bullets have a true diameter of 6.71mm / 0.264 ...
The .223 Remington and 5.56×45mm NATO barrel chamberings are not the same. [13] While the cartridges are identical other than powder load, bullet weight, and chamber pressure, a significant difference is in the barrel of the rifle to be used, not in the cartridge.
Later various derivatives were created using the same basic cartridge, but with smaller-diameter bullets; these were named by the cartridge diameter at the base and mouth. The original No. 56 became the .56-56, and the smaller versions, .56-52, .56-50, and .56-46. The 56–52, the most common of the new calibers, used a 50-cal bullet.
The damage caused by the 5.56 mm bullet was originally believed to be caused by "tumbling" due to the slow 1 turn in 14-inch (360 mm) rifling twist rate. [67] However, any pointed lead core bullet will "tumble" after penetration into flesh, because the center of gravity is towards the rear of the bullet.
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