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Most load data published is for .223. The .223 dies will work for 5.56 loading, as the casing size is the same. Bullet diameters will be the same, .224".
The differences are:
- a slightly different set of tolerances
- a slightly different leade shape in the throat
- a slightly different pressure specification
- a different unit of pressure measurement
Use the same tools.
Edit: and, until you're pushing on the very edges of the pressure envelope for 5.56, you're still in .223Rem territory. I have never found a reason to distinguish the two in loading.
Same components ,if using .223 data you will be plenty safe . Some powder sites will list 5.56 along with .223 data , studying those numbers will give you and idea of the differences when it comes to pressure, etc . .
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