difference between .223 cal and nato 5.56 - Deer Hunting Forums

Go Back   Deer Hunting Forums > General Forums > The Lodge
The Lodge Meet other hunters and share hunting stories, tips, and tricks.

Thread Tools Display Modes
  #1 (permalink)  
Old 07-27-2009, 10:13 PM
Scrub Buck
Join Date: Dec 2008
Posts: 2
Default difference between .223 cal and nato 5.56

I have a DPMS Ar-15 chambered in .223, I have been told that 5.56mm ammo is the same and that it safe to use in my weapon.
Please clarify if possible.
Reply With Quote
Sponsored Links
  #2 (permalink)  
Old 07-27-2009, 10:22 PM
hunt NH's Avatar
B&C 160 Class
Join Date: Jul 2009
Location: concord nh
Posts: 1,203

.223= 5.56
Reply With Quote
  #3 (permalink)  
Old 07-28-2009, 09:37 AM
Scrub Buck
Join Date: Jul 2009
Location: Illinois
Posts: 10

5.56 is the metric and nato way of saying/labeling our .223. You can shoot .222 in that .223 also, but it wont be .222 anymore. I had some leftover .222 brass years ago noone wanted so I reloaded it and shot it thru my .223.
Reply With Quote
  #4 (permalink)  
Old 07-28-2009, 11:50 AM
Id0ntlikeyou's Avatar
B&C 100 Class
Join Date: Oct 2008
Location: Seguin, TX
Posts: 142

both of my esteemed collegues here are correct. Its the same round. military just uses 5.56 instead of .223 because NATO uses the metric system.
"War is an ugly thing, but not the ugliest of things. The decayed and degraded state of moral and patriotic feeling which thinks that nothing is worth war is much worse. The person who has nothing for which he is willing to fight, nothing which is more important than his own personal safety, is a miserable creature and has no chance of being free unless made and kept so by the exertions of better men than himself."
-John Stewart Mill
Reply With Quote
  #5 (permalink)  
Old 07-28-2009, 04:22 PM
Posts: n/a

you can safely shoot either but I believe there is a slight difference in the casing. i think its in the shoulder. some rifles will shoot one better than the other. at least thats the impression i got somewhere along the way. I could be wrong though. I never bothered to check the specs on the casing.
Reply With Quote
  #6 (permalink)  
Old 07-28-2009, 06:08 PM
timberghost's Avatar
Join Date: Oct 2007
Location: western new york
Posts: 3,942

Would that mess up the barrels rifling????????
Reply With Quote
  #7 (permalink)  
Old 07-29-2009, 07:25 AM
BruceBruce1959's Avatar  
Join Date: Jan 2007
Location: Vermont
Posts: 5,644

from Wikipedia,,, 5.56mm NATO vs .223 Remington

The 5.56 mm NATO and .223 Remington cartridges and chamberings are similar but not identical. Military cases are generally made from thicker brass than commercial cases; this reduces the powder capacity (an important consideration for handloaders[8]), and the NATO specification allows a higher chamber pressure. NATO EPVAT test barrels made for 5.56 mm NATO measure chamber pressure at the case mouth, as opposed to the location used by the United States civil standards organization SAAMI. The piezoelectric sensors or transducers NATO and SAAMI use to conduct the actual pressure measurements also differ. This difference in measurement method accounts for upwards of 137.9 MPa (20,000 psi) difference in pressure measurements. This means the NATO EPVAT maximum service pressure of 430 MPa (62,366 psi) for 5.56 mm NATO, is reduced by SAAMI to 379.21 MPa (55,000 psi) for .223 Remington.[9] In contrast to SAAMI, the other main civil standards organization C.I.P. defines the maximum service and proof test pressures of the .223 Remington cartridge equal to the 5.56 mm NATO.

The 5.56 mm NATO chambering, known as a NATO or mil-spec chamber, has a longer leade, which is the distance between the mouth of the cartridge and the point at which the rifling engages the bullet. The .223 Remington chambering, known as SAAMI chamber, is allowed to have a shorter leade, and is only required to be proof tested to the lower SAAMI chamber pressure. To address these issues, various proprietary chambers exist, such as the Wylde chamber (Rock River Arms)[10] or the ArmaLite chamber, which are designed to handle both 5.56 mm NATO and .223 Remington equally well. The dimensions and leade of the .223 Remington minimum C.I.P. chamber also differ from the 5.56 mm NATO chamber specification.

Using commercial .223 Remington cartridges in a 5.56 mm NATO chambered rifle should work reliably, but generally will not be as accurate as when fired from a .223 Remington chambered gun due to the longer leade.[11] Using 5.56 mm NATO mil-spec cartridges (such as the M855) in a .223 Remington chambered rifle can lead to excessive wear and stress on the rifle and even be unsafe, and the SAAMI recommends against the practice.[12][13] Some commercial rifles marked as ".223 Remington" are in fact suited for 5.56 mm NATO, such as many commercial AR-15 variants and the Ruger Mini-14, but the manufacturer should always be consulted to verify that this is acceptable before attempting it, and signs of excessive pressure (such as flattening or gas staining of the primers) should be looked for in the initial testing with 5.56 mm NATO ammunition.[14]
Democracy is two wolves and a lamb voting on what to have for lunch.
Liberty is a well-armed lamb contesting the outcome of the vote.
-Benjamin Franklin

Reply With Quote

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Top Posters
Hunting Man8160
joel the signman3608
hunt NH1203
my hunt
my hunt

All times are GMT -5. The time now is 11:38 PM.

User Alert System provided by Advanced User Tagging (Pro) - vBulletin Mods & Addons Copyright © 2015 DragonByte Technologies Ltd.

SEO by vBSEO 3.6.1