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Picture for category 5.56×45mm NATO

5.56×45mm NATO

The 5.56×45mm NATO is a rimless bottlenecked intermediate cartridge family developed in the late 1970s in Belgium by FN Herstal. It consists of the SS109, SS110, and SS111 cartridges. Wikipedia
Bullet diameter: 5.70 mm (0.224 in)
Maximum pressure (SCATP 5.56): 380.00 MPa (55,114 psi)
Maximum pressure (EPVAT): 430.00 MPa (62,366 psi)
Case length: 44.70 mm (1.760 in)
Neck diameter: 6.43 mm (0.253 in)
Shoulder diameter: 9.00 mm (0.354 in)
Base diameter: 9.58 mm (0.377 in)
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