Do you size 223 Rem differently from 5.56 Nato?

Unregistered · March 6, 2008, 12:28 AM

Someone in another thread mentioned sizing the brass differenly so the neck was in a slightly different spot. I have never seen anyone else reference this, and have always loaded 223 and 5.56 exactly the same.

Opinions?

fourrobert13 · March 6, 2008, 12:52 AM

I size them both the same way when loading them for my AR's. The only time I do any thing different is when I neck size only for my bolt action. 5.56 and 223 are essentually the same round but the 5.56 is loaded to higher pressure and the brass is thicker. I can't see why some would say they would need to be sized differently, but maybe I am wrong. Who knows?

kkb · March 6, 2008, 12:58 AM

My bad, I was in error. I'll go back and edit my answer.

Thanks for making me go check my facts. The exterior cartridge dimensions are the same for .223 and 5.56mm

amamnn · March 6, 2008, 02:27 AM

There are a few things you need to keep in mind when loading for any of the military gas operated semi autos and their clones.

http://www.exteriorballistics.com/re...sgunreload.cfm

Bullet94 · March 7, 2008, 12:33 AM

Some real good info here -

http://www.6mmbr.com/223Rem.html

March 6, 2008, 12:28 AM	#1
Unregistered Junior member Join Date: May 9, 2005 Posts: 1,802	Do you size 223 Rem differently from 5.56 Nato? Someone in another thread mentioned sizing the brass differenly so the neck was in a slightly different spot. I have never seen anyone else reference this, and have always loaded 223 and 5.56 exactly the same. Opinions?

March 6, 2008, 12:52 AM	#2
fourrobert13 Senior Member Join Date: November 28, 2005 Location: South West Ohio Posts: 336	I size them both the same way when loading them for my AR's. The only time I do any thing different is when I neck size only for my bolt action. 5.56 and 223 are essentually the same round but the 5.56 is loaded to higher pressure and the brass is thicker. I can't see why some would say they would need to be sized differently, but maybe I am wrong. Who knows? __________________ Be aware of yourself and everything around you.

March 6, 2008, 02:27 AM	#4
amamnn Senior Member Join Date: May 13, 2006 Location: WA, the left armpit of the USA Posts: 1,323	There are a few things you need to keep in mind when loading for any of the military gas operated semi autos and their clones. http://www.exteriorballistics.com/re...sgunreload.cfm __________________ "If the enemy is in range, so are you." - Infantry Journal

March 7, 2008, 12:33 AM	#5
Bullet94 Senior Member Join Date: September 8, 2004 Location: Kansas Posts: 723	Some real good info here - http://www.6mmbr.com/223Rem.html __________________ PRO-SECOND AMENDMENT - Live Free or Die

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March 6, 2008, 12:58 AM	#3
kkb Senior Member Join Date: September 5, 2004 Location: Western Slope, Colorado Posts: 403	My bad, I was in error. I'll go back and edit my answer. Thanks for making me go check my facts. The exterior cartridge dimensions are the same for .223 and 5.56mm