5.45x39 vs 5.56 nato

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This round was designed and released in 1964 by Remington Arms, thus the name. 223 Remington is a common United States cartridge having similar dimensions to the 5.56x45mm NATO, the difference being that the 5.56 has a greater psi. Cartridge Type: Rifle Height: 1.76' Width: 0.378' Average FPS: 3148 Average Energy: 1254 Average Gr: 57 Recoil: 0.8 Power Rank: 1.79 of 20