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Don29palms
06-21-2010, 8:34 PM
I know this might be a really stupid question but I don't know the answer. Is 5.56x45 NATO and .223 Remington the same round? If not are they interchangeable like .38 special and .357 magnum? Again I apologize.

Noobert
06-21-2010, 8:35 PM
No, .223 can go in a 5.56 chamber, but not the other way around

killshot44
06-21-2010, 8:46 PM
Welcome to Calguns....

What Noobert said....here's the skinny:
Is the .223 Remington the same as the 5.56x45? The answer is yes and no. There ARE differences between the .223 Remington as shot in civilian rifles and the 5.56x45 in military use. While the external cartridge dimensions are essentially the same, the .223 Remington is built to SAAMI specs, rated to 50,000 CUP max pressure, and normally has a shorter throat. The 5.56x45 is built to NATO specs, rated to 60,000 CUP max pressure, and has a longer throat, optimized to shoot long bullets. That said, there are various .223 Remington match chambers, including the Wylde chamber, that feature longer throats. Military 5.56x45 brass often, but not always, has thicker internal construction, and slightly less capacity than commercial .223 Rem brass.


Get to know the Search feature, use the one linked to Google, search, read then post and you'll avoid being That Guy.

Milsurps
06-21-2010, 8:53 PM
No, .223 can go in a 5.56 chamber, but not the other way around
Generally your right. Ruger Mini-14 and possibly others will handle both. Shoot 5.56 all the time in my Mini-14 Ranch, it works great. Damn, so many rules and exceptions... :confused:

Don29palms
06-21-2010, 9:35 PM
The reason I ask is I am thinking about getting an AR 15 and I see some saying they are chambered for .223 Remington and some for 5.56x45 NATO. It sounds like I should get one chambered for the NATO round.

Josh3239
06-21-2010, 9:43 PM
Yes, you want a 5.56. 99% of the time they are used interchangably. I think most of the .223 ARs are Wylde chambers that allow both cartridges to be used, there are very few that are only .223. Buy from a good company and you won't have to worry. BCM, Daniel Defense, LMT, and the RifleGear uppers are all top shelf.

themethod
06-21-2010, 9:43 PM
The issue is not if 5.56 will work in a .223 rifle. It will. However .223 chamber/barrel are not made for the higher pressure a 5.56 round is capable of. I doubt that difference would cause a rifle to go *kaboom* but if you value your weapon you just shouldn't abuse it like that. Besides who knows, it just might go *kaboom* on you. Are you willing to take that risk?

Josh3239
06-21-2010, 9:48 PM
"Here's the problem. Many NATO cartridges have bullets that will become jammed into the rifling of a SAAMI chambering (the throat is too short). This is VERY DANGEROUS, for a great number of reasons." - Fulton Armory

The issue is not if 5.56 will work in a .223 rifle. It will. However .223 chamber/barrel are not made for the higher pressure a 5.56 round is capable of. I doubt that difference would cause a rifle to go *kaboom* but if you value your weapon you just shouldn't abuse it like that. Besides who knows, it just might go *kaboom* on you. Are you willing to take that risk?

luckystrike
06-21-2010, 9:48 PM
put a 556 and a stray 223 in your mag or other way around and you will have no idea wich one had the 223

bayboydray408
06-21-2010, 10:14 PM
get an ak and fire any type of 7.62x39 allday long!! haha

akjunkie
06-21-2010, 10:34 PM
I know this might be a really stupid question but I don't know the answer. Is 5.56x45 NATO and .223 Remington the same round? If not are they interchangeable like .38 special and .357 magnum? Again I apologize.


Good place to get Educated>> AMMO ORACLE

http://ammo.ar15.com/ammo/

killmime1234
06-21-2010, 10:52 PM
The issue is not if 5.56 will work in a .223 rifle. It will. However .223 chamber/barrel are not made for the higher pressure a 5.56 round is capable of. I doubt that difference would cause a rifle to go *kaboom* but if you value your weapon you just shouldn't abuse it like that. Besides who knows, it just might go *kaboom* on you. Are you willing to take that risk?
^^This^^
Shooting 5.56 in a rifle chambered in .223 is like running your car a quart low on oil. It'll work. Heck, it'll probably work for quite some time, but your in for expensive and potentially dangerous trouble at an unexpected time down the road. My advice: just get something chambered in 5.56 and don't worry about it.

Peashooter
06-21-2010, 11:32 PM
Well ? The keltec su 16 is the only rifle that has ever jammed with a FTE than any others I have fired in 25 years with mixed ammo.
I have run my ar's without lube and barely anycleaning without fail for years and just a wipedown and maybe a couple of drops of lube without a problem.. The mini will digest anything. I bought 10's of thousands of surplus boxer ammo before it got crazy xpensive. and reload the brass and have shot thousands of rounds though my guns and the Keltek is for sale ! lol

thayne
06-21-2010, 11:34 PM
I know this might be a really stupid question but I don't know the answer. Is 5.56x45 NATO and .223 Remington the same round? If not are they interchangeable like .38 special and .357 magnum? Again I apologize.

.38 Special and .357 Magnum are not interchangeable. You can shoot 38 special in a 357 mag, but not the other way around.