File:5.56x45mm NATO dimensions.jpg
Cartridge dimensions
The 5.56x45mm NATO has 1.85 ml] (28.5 grains H2O) cartridge case capacity.
5.56x45mm NATO maximum NATO cartridge dimensions. All sizes in millimeters (mm). (see NATO EPVAT testing, QuickLOAD)
Americans would define the shoulder angle at alpha/2 = 23 degrees. The common rifling twist rate for this cartridge is 178 mm (1 in 7 in) or 229 mm (1 in 9 in), 6 grooves, Ø lands = 5.56 mm, Ø grooves = 5.59 mm, land width = 1.88 mm and the primer type is small rifle.
According to the official NATO proofing guidelines the 5.56x45mm NATO case can handle up to 430 MPa (62,367 psi) piezo service pressure. In NATO regulated organizations every rifle cartridge combo has to be proofed at 125% of this maximum pressure to certify for service issue. This is equal to the C.I.P. maximum pressure guideline for the .223 Remington cartridge, that is the 5.56x45mm NATO parent cartridge.
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