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Old June 7, 2012, 01:28 PM   #1
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Bullet Diameter

This may sound dumb, but what dia. bullet should I be using for my 5.56x45 AR? I was told before to use .224 (which I am using) someone told me I should use .223. Why the mixed info?
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Old June 7, 2012, 01:36 PM   #2
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All (or darn near virtually all) modern 22 caliber cartridges use .224 bullets, including the .223 Rem and 5.56.

OLD 22 hornet guns used .223 bullets but even that cartridge was changed to .224 a long time ago. 1960s, I think.
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Old June 7, 2012, 02:47 PM   #3
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Yep, 99% of today's .22 bullets are .224". I think your friend may have meant the same bullet as the .223 Remington. .223 being the designation most used for the 223 Rem...
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Old June 7, 2012, 03:57 PM   #4
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Yep. He may have said ".223 bullet" meaning a bullet for the .223 Remington (a .224" bullet). Some of the confusion is the cartridge nomenclature. The NATO version cartridge is called 5.56 mm, but that works out to .219" and refers only to the bore diameter drilled and reamed into a barrel blank before rifling it, so it does does not include the depth of the grooves between the rifling lands. A jacketed bullet is normally sized to groove diameter, not bore diameter.
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