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The .223 Remington (designated 223 Remington by SAAMI [4] and 223 Rem. by the C.I.P. [5]) is a rimless, bottlenecked, centerfire intermediate cartridge.It was developed in 1957 by Remington Arms and Fairchild Industries for the U.S. Continental Army Command of the United States Army as part of a project to create a small-caliber, high-velocity firearm.
Aug 17, 2011 · The .223 Remington cartridge is the commercial equivalent of the 5.56 X 45 NATO. Some don't understand that from a physical dimension standpoint these cartridges are indeed one in the same ...
- 223 Remington and 5.56 NATO Came to Be
- Vs- 5.56 Ammunition
- Confusion: Pressure Ratings and Testing
- Remington and 5.56 NATO Chamber Differences
- /5.56 Hybrid Chambers
- Remington and 5.56 NATO Ammunition Interoperability
- Oading 223 Remington and 5.56 NATO Ammunition
- Conclusion
While this is by no means exhaustive, I thought I’d summarize the events that lead us to this point in time- this age where there’s a plethora of different rifles, chamber specifications, load data, information, and mis-information all related to the AR-15 and the 223 Remington cartridge. Here’s a rough timeline of events:
There are some differences you’ll notice right off the bat between .223 Remington and 5.56 NATO Ammunition: 1. On the case rim, you’ll notice “223” stamped on 223 Remington brass, where 5.56 NATO brass may only have a date, initials (Ex: FC) and one or more symbols 2. On the case rim, you’ll notice that 5.56 military ammunition will have a crimp ar...
Where much of the confusion comes when trying to understand the differences between 223 Remington and 5.56 NATO ammunition is when reading the published maximum allowed pressure for each cartridge. You may see data published that looks like this: …and this data would make it appear that 5.56 NATO ammunition is certified “to a higher pressure” than ...
There is some information that’s easy to find on the internet, and some that must be gathered from reputable online sources and industry players (large companies, smaller reamer grinding shops, and everything in between). I’ll note here that chamber dimensions seem to be somewhat “open to interpretation” by reamer manufacturers and firearms OEMs. S...
Also note that there are several “hybrid chamber” designs out there that “split the difference” between the 5.56 NATO chamber specification and the 223 Remington chamber specification. These include the 223 Wylde, and Noveske’s hybrid chamber. It may or may not be safe to shoot 5.56 NATO ammunition in 223-variant chambers: check your manufacturer’s...
SAMMI makes it quite clear- you can shoot 223 Remington ammunition in a 5.55 chamber, but you shouldn’t shoot 5.56 ammunition in a 223 Remington chamber: So why is this? We already talked about how the cases and exterior ammunition dimensions are nearly the same. It has to do mostly with bullet profile! The military has used a wide variety of bulle...
Reloading 223 Remington and 5.56 NATO ammunition is essentially the same as loading most other bottleneck rifle cartridges. You will use the same press, powder measure, shellplate or shellholder, and so on and so forth. Reloading dies are the same for 223 Remington and 5.56 NATO because as we’ve already discussed, the exterior dimensions are essent...
In short- rifles chambered in 5.56 NATO are most versatile and perhaps most reliable. Rifles chambered in 223 Remington can offer enhanced accuracy, but are potentially less reliable in a semi-automatic rifle like the AR-15. Hybrid chambers attempt to offer the best of both worlds. It is safe to shoot 223 Remington cartridges in any 223-variant cha...
Apr 8, 2024 · The 223 Wylde chamber is designed with the external dimensions and leade angle of the 5.56 NATO cartridge, combined with the .2240 inch freebore diameter of the .223 Remington. This means you can shoot .223 ammo with the precision you expect and also safely fire 5.56 rounds without worrying about excessive pressure.
Oct 14, 2020 · However, given common differences in loads and throats, it’s a good idea not to use 5.56mm ammo in a firearm with a dedicated .223 chamber. In 1979, SAAMI cautioned that 5.56 chambers differ from those in .223 sporting rifles, and that use of 5.56 ammo in .223 rifles could jack pressures to unsafe levels.
Sep 5, 2022 · The .223 Remington grew from the US military’s search for a smaller, mid-sized cartridge to replace the 7.62x51mm NATO round. Remington’s offering was based on the popular and accurate .222 Remington that debuted in 1950. The .222 Remington was a target and varmint round, but it didn’t have the necessary velocity and power.
People also ask
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Feb 2, 2019 · By contrast, the .223 Remington has a shorter leade and sharper rifling angle, the design stemming from a desire for top accuracy. Today, the difference can be marked. The leade on a proper 5.56 chamber is twice or more than that of a .223 chamber, and the onset angle of the 5.56 rifling creates a ramp with four times the distance.
