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File:5.56x45mm NATO dimensions.jpg ...x45mm NATO maximum NATO cartridge dimensions'''. All sizes in millimeters (mm). (see [[NATO EPVAT testing]], [[QuickLOAD]]) ...n), 6 grooves, Ø lands = 5.56 mm, Ø grooves = 5.59 mm, land width = 1.88 mm and the [[Percussion cap|primer type]] is small rifle.(1,125 × 799 (86 KB)) - 10:31, 19 April 2013