What is the differance between 556 caliber and 223 caliber?
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Answer:
The cartridges are similar, but not identical. Differences include: Slight variations in neck diameter Slight variations in base diameter (.378 inches for the 5.56 vs. .376 inches for the .223) Variations in the neck angle Pressure rating (380 MPa for the .223 vs. 430 MPa for the 5.56) Case thickness You can safely fire .223 rounds in a 5.56 rifle, but it is not advisable to fire 5.56 rounds in a dedicated .223 rifle.
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