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longunner 10-28-2013 06:12 PM

I have an AR chambered in 5.56 and I bought a case of 5.56 federal and I shot all of it and now I have a bunch of once fired 5.56 casings. I am looking at getting a remington 700 in .223 and I know the common question can you shoot 5.56 in a .223 chamber and i know you cant. My question is can you use 5.56 brass to reload for .223? I did a bit of searching on other forums and got all kinds of answers, both yes and no. I just want a straight up answer for a straight up question so please if you aren't 100% sure don't put my face my rifle and my life in danger. Thanks in advance for the help

Argyle_Armoring 10-28-2013 06:26 PM

Yes. You are good to go.

Anna_Purna 10-28-2013 06:34 PM

Longunner, is your brass Boxer or Berdan primered? (1 or 2 flash holes for the primer)

SSGN_Doc 10-28-2013 06:42 PM

Yes Federal 5.56 can be loaded for use in a .223 bolt action. Work your loads up slow, starting at 10% or more below the loads in the manual at first. Powder capacity of some 5.56 cases can be smaller due to thicker case walls in some instances (not always but it's just a good precaution). After you use the cases in your bolt gun you may consider a neck sizing die as your cases will be fire formed for that chamber and you may get even better accuracy out of them after they are trimmed and reused in the bolt gun on their third firing.

Sniper03 10-28-2013 06:53 PM


Doc is absolutely correct! You can use your 5.56 Brass to load for your 223 rifle.
But you should never shoot military 5.56 ammunition in a rifle chambered for 223 Remington.
The reason is the 5.56 Military Chamber has more free bore (some call it lead) in the chamber. To simplify this is the distance of the chamber where the casing stops and the riflings begin. And taking in consideration the 5.56 NATO ammunition is also hotter than 223 Remington Ammunition. And the "true" 223 Chamber has less free bore (Lead) in the chamber than the 5.56. So if the 5.56 Military ammunition is fired in a true 223 Remington Chamber the pressure spikes to possible unsafe levels. So with that said and as Doc mentioned, you can use your 5.56 cases with lower powder loads. I would start at the middle of recommended 223 powder charges per the loading manuals.


longunner 10-28-2013 07:35 PM


Originally Posted by Anna_Purna
Longunner, is your brass Boxer or Berdan primered? (1 or 2 flash holes for the primer)

I believe it has 2, I'm not at home right now but ill check it out when I get there

longunner 10-28-2013 07:36 PM

Sweet thanks for the answers guys, good to know it will work out....I have a couple more things to get before I start reloading and I can't wait to get this brass loaded up

Anna_Purna 10-28-2013 07:40 PM


Originally Posted by longunner (Post 1416029)
I believe it has 2, I'm not at home right now but ill check it out when I get there

If it has the 2 holes, you wont be able to reload them. They are of Russian?? Design and you could end up bending your De-primer stem on your Die. Visually check all your brass under a bright light to make sure you don't have any of those in the mix or you wll run into problems. The one flash hole in the middle of the bottom will be fine as the others have said to reload.

Sniper03 10-28-2013 07:42 PM


Before replacing the new primers you may need a primer pocket reamer. A lot of 5.56 military rounds have the primer pocket crimped.


longunner 10-28-2013 07:54 PM

I already deprimed and resized them...:eek: it's not steel case and it's federal so I'm assuming its not Russian design??? :confused:

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