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Tractor Talk Discussion Forum

Re: Gun Experts? 5,56 VS .223

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Author  [Modern View]

11-27-2012 15:35:03

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The over all size is very close but the pressure is higher on a 5.56. You can shoot .223 in a 5.56 but not 5.56 in a .223.

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11-27-2012 16:10:38

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 Re: Gun Experts? 5,56 VS .223 in reply to Dauber, 11-27-2012 15:35:03  
i agree with what KEH said

5.56 is around 62,000 units of pressure

.223 is a max pressure of around 55,000 units of pressure

(measuring pressures is highly technical and there are several different methods and many variables i give the numbers only for comparison purposes)

additionally the 5.56 chamber allows for greater variance cartridge sizing to allow for better inter-operability with in NATO countries.

the bottom line is they are not the same round they are governed by different standards organizations (.223 by SAAMI and 5.56 by NATO)

US Army Ordnance Officer

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11-27-2012 20:31:33

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 Re: Gun Experts? 5,56 VS .223 in reply to FarmerZeb, 11-27-2012 16:10:38  
You all seemed to miss the one item that effects accuracy with the 62 grain Bullet.. The 62 grain bulled requires a MUCH Faster Twist than a 55 grain, to stabilize it.. We are talking a 1 in 7" twist, for the Mil Spec Ammo.. 55 Gr will shoot fine with a 1 in 10" twist..


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