I would love to know these Anwsers! - Page 2
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Old 11-13-2008, 12:20 AM   #11
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They are the same round, my AR is stamped .223 cal (5.56mm) on the reciever. 5.56mm is a metric measurement, converted to English/US inch measurement it's actually a .225 which is very close to .223.

http://www.warwheels.net/CaliberConversionChartHAUGH.html

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Old 11-13-2008, 12:27 AM   #12
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Quote:
Originally Posted by dragunovsks View Post
They are the same round, my AR is stamped .223 cal (5.56mm) on the reciever. 5.56mm is a metric measurement, converted to English/US inch measurement it's actually a .225 which is very close to .223.

http://www.warwheels.net/CaliberConversionChartHAUGH.html
That's not true at all. Why do you think .223 Wylde was created? Even SAAMI will tell you not to fire 5.56x45 mm in a .223 Rem chambered weapon.
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Old 11-13-2008, 12:34 AM   #13
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Then why is it stamped on my rifle? I've never heard of .223 Wylde.

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1978 YUGO SKS, 7.62x39
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Old 11-13-2008, 04:01 AM   #14
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Then why is it stamped on my rifle? I've never heard of .223 Wylde.
.223 Wylde is a compromise between the chambers of .223 Rem and 5.56x45 NATO. It's designed to withstand the higher pressures of the 5.56x45 NATO.
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Old 11-13-2008, 04:40 AM   #15
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If you have an AR and the bbl is stamped 5.56, but the receiver is stamped .223, go with the stamps on the bbl.

The rounds (.223 and 5.56x45) are not the same. The 5.56 chamber has a longer throat (the part of the chamber just before the rifling begins). And the 5.56 has higher chamber pressures.

The bbl markings dictate the chamber dimensions, thus the caliber. 5.56 will fire .223 with no problems.

The .223 chamber will tend to be more accurate, due mainly to less free travel of the bullet (as it crosses the long throat).

And it has been very common for shooters to use each round in their rifles, no matter the markings, for many years. Problems are rare, and are usually reliability related, more than safety related. But you should still heed the warnings of SAAMI and use the right caliber.

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Old 11-13-2008, 08:38 PM   #16
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I understand to go with what the barrel says but my rifle is stamped .223 cal. followed immediately by (5.56mm) on the reciever.

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1978 YUGO SKS, 7.62x39
NEF Protector Pump, 12 gauge
Savage Model 64, .22LR
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Rock Island Armory 1911A1, .45 ACP
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Old 11-13-2008, 08:53 PM   #17
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Quote:
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I understand to go with what the barrel says but my rifle is stamped .223 cal. followed immediately by (5.56mm) on the reciever.
Essentially what you have is a receiver that a company has put before a testing committee, and probably a lawyer or 3, and determined that their rifle will safely fire both the .223 Civilian and the 5.56 Nato without anything happening to you, the end user.

If you had an AR, for example, that was rated for .223 caliber - and said nowhere about 5.56mm, but you used it and something happened, because the 5.56mm runs at a hotter pressure, that company could be liable.

That is where .223 Wylde came in - it's a compromise chamber that will safely accept the different throat lengths of the two cartridges, as well as the higher pressure of the 5.56.

JD
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