223 Remington vs. 5.56 NATO - What's the Difference? – Top Brass Reloading Supplies
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Case cartridges for the 5.56 NATO (5.56 x 45 mm) and the .223 Remington are very similar. For all practical purposes, the external dimensions are identical, and one can effectively say that there exists no difference between the two. Both are designed to accommodate a .224 inch (5.56 mm) bullet between 40 to 85 grains
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223 Reloading Bullets - Match Grade - $82 per 1,000
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Starline .223 Remington Brass Cases
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22LR VS 223: A Tale Of Two Calibers - Wideners Shooting, Hunting & Gun Blog
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22LR VS 223: A Tale Of Two Calibers - Wideners Shooting, Hunting & Gun Blog
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Shooting the Bull: The 5.56mm NATO vs. the .223 Remington