5.56 vs 223 — can my rifle shoot both?
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I see 5.56 and .223 used interchangeably. Are they the same, and is it safe to shoot 5.56 in my rifle?
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✓ Best Answer
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They are dimensionally the same but 5.56 NATO runs at higher pressure than .223 Remington. A rifle chambered in 5.56 (or .223 Wylde) can safely fire both. A rifle marked .223 only should NOT be fed 5.56 — it can spike pressure. Check the stamp on your barrel. Most ARs are 5.56 or Wylde, so they will handle either, but always confirm rather than assume.