.223 vs 5.56


Firearm & Gun Forum - FireArmsTalk.com > Gear & Accessories > Ammunition & Reloading > .223 vs 5.56

Reply
 
LinkBack Thread Tools Display Modes
Old 04-08-2010, 03:49 AM   #1
Feedback Score: 0 reviews
 
Join Date: Mar 2010
Posts: 14
Default .223 vs 5.56

I've heard/been told that even though .223 and 5.56 are similar and can be interchanged. What exactly is the difference? Or am I simply just hearing lies? While I'm here, I might as well ask what the difference between .308 and NATO 7.62 x 51 is, because I honestly have no idea.



__________________
ZackB is offline  
 
Reply With Quote

Join FirearmsTalk.com Today - It's Free!

Are you a firearms enthusiast? Then we hope you will join the community. You will gain access to post, create threads, private message, upload images, join groups and more.

Firearms Talk is owned and operated by fellow firearms enthusiasts. We strive to offer a non-commercial community to learn and share information.

Join FirearmsTalk.com Today! - Click Here


Old 04-08-2010, 04:17 AM   #2
Feedback Score: 0 reviews
 
Join Date: Mar 2010
Location: TX
Posts: 1,118
Liked 2 Times on 2 Posts

Default

5.56x45mm NATO - Wikipedia, the free encyclopedia

http://en.wikipedia.org/wiki/7.62x51mm_NATO


__________________

Last edited by Poink88; 04-08-2010 at 04:19 AM.
Poink88 is offline  
 
Reply With Quote
Old 04-08-2010, 07:47 AM   #3
Feedback Score: 0 reviews
 
LittleBear's Avatar
 
Join Date: Mar 2010
Posts: 24
Default

The general rule of thumb us is. You can shoot .223 out of a 5.56 but you cannot shoot a 5.56 out of a .223...5.56 is a Hotter Load, greater pressure....

__________________

Character, in the long run, is the decisive factor in the life of an individual and of nations alike.

Theodore Roosevelt
LittleBear is offline  
 
Reply With Quote
Old 04-08-2010, 01:15 PM   #4
Moderator
FTF_MODERATOR.png
Feedback Score: 1 reviews
 
robocop10mm's Avatar
 
Join Date: Jul 2007
Location: Austin,Texas, by God!!
Posts: 10,071
Liked 2736 Times on 1433 Posts
Likes Given: 231

Default

And then the opposite is true in the .30 calibers. .308 is hotter than 7.62 X 51 (NATO) and .30-06 Commercial ammo can be bad for some military rifles (M-1 Garand).

__________________

In life, strive to take the high road....It offers a better field of fire.
"Robo is right" Fuzzball

robocop10mm is online now  
 
Reply With Quote
Old 04-08-2010, 01:48 PM   #5
FTF_SUPPORTER.png
Feedback Score: 0 reviews
 
Join Date: Jul 2007
Location: SW OK
Posts: 4,359
Liked 2112 Times on 1141 Posts
Likes Given: 3177

Default

I've been firing 5.56mm military ball ammo in .223 chambered rifles for over 40 years with no problems at all. There are several SAAMI myths concerning the alleged differences between .223 vs 5.56mm ammo pressures, case thickness, etc. The US 5.56mm military M193 ball round generates 52,000 psi. See page 10-3 US Army TM 43-0001-27:

http://www.scribd.com/doc/13027441/ammo-data-sheets-small-caliber-firearms

SAAMI waited for 30 years before warning us of the "dangers" of firing 5.56mm military ball ammo in .223 chambers. This "warning" came at the same time the US market was flooded with 5.56mm military surplus ammo.

There are about a dozen different .223/5.56mm chambers. Here are the dimensions of eight of them:

http://www.ar15barrels.com/data/223-556.pdf


SAAMI "warns" us that all military 5.56mm cases are very thick. This is not so. For over 40 years I have weighed the cases for all of my accuracy loads. The thickest us made cases are .223 Federal Gold Medal and American Eagle. Some, if not all, Brit military 5.56mm cases are very thick. Lapua .223 cases are very thick.

Go to Brass Weights:

AR15BARRELS.COM - Technical Documents




One exception: If your gun has a tight match chamber do not attempt to fire military ball in it.



__________________

Last edited by alsaqr; 04-08-2010 at 01:54 PM.
alsaqr is offline  
 
Reply With Quote
Reply

Thread Tools
Display Modes