.223 remington versus 5.56 x 45 mm NATO - is it safe to interchange???

glockgrouptherapy said:
i wish i had the source for my 2 cents but it stated that the rounds/projectiles were not the issue but it was the casing/brass that was the troubled area. argument was that the NATO casings were different than civ brass. primer seating depth was another bit too


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Both are incorrect. Measurements of the capacity 5.56 brass vs. 223 brass show enough variance that the old "rule of thumb" about lower case capacity in 5.56 is not necessarily the "case" - although it often is - and in any event case capacity has nothing to do with pressure, the load is merely adjusted.

Primers and seating are identical from 5.56 to .223 - never heard this one before. The only difference is that 5.56 will be crimped and .223 only may be crimped. Again, nothing to do with pressures.
 
acrashb said:
Both are incorrect. Measurements of the capacity 5.56 brass vs. 223 brass show enough variance that the old "rule of thumb" about lower case capacity in 5.56 is not necessarily the "case" - although it often is - and in any event case capacity has nothing to do with pressure, the load is merely adjusted. Primers and seating are identical from 5.56 to .223 - never heard this one before. The only difference is that 5.56 will be crimped and .223 only may be crimped. Again, nothing to do with pressures.
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Ah right the crimping forgot about that. I must have miss read the peice of brass "sizing". Thanks for the correction.
 
Boltgun said:
More info here:

http://www.gundigest.com/223-vs-5-56

Boltgun
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jmiddy said:
Yea the guy who wrote that article apparently has never been to a Carbine course, he said anyone whom says they have fired 1000 rds over the course of a weekend is lying, and the barrel would be shot out, "smoked" is his words.

My opinion the guy is a moron.
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Quote from the article: "I teach law enforcement patrol rifle classes in the summer, and I see how much work (and have done it myself) it takes to run 1,000 rounds through a rifle. If your buddy says “Yea, we went to the range this weekend and put a thousand rounds through each rifle,” he’s exaggerating. And if he isn’t, you do not want to borrow any of his rifles, as a thousand rounds in two days is enough to smoke the barrel."

I gotta agree, the guy who wrote this is a complete tool, what exactly does "Smoke a barrel" even mean, and what difference does it make if you put 1000 rounds through a barrel in a week or two days, the barrel is gunna last for 10's of thousands of rounds, WTF is this idiot blathering on about?

I've put 1000 rounds through a barrel in a couple or maybe a few days. It's a lot I know but to high volume shooters it's just a really educational few days! Try doing a 2 day advanced carbine course, or better yet, some of the high risk security type/Infantry courses they run down in the states, you could easily run 2500 rounds in 4-5 day course. Some of them list the supplies you'll need to bring and for a 2 day course your looking at 800-1500 carbine rounds, then the 4-5 day courses are asking for closer to 2500-3000 carbine rounds.
 
There is no CIP 5.56 chamber, CIP only knows .223 Rem.
In contrast to a true CIP 223 chamber, SwissArms rifles have a larger free flight (which ist still in the tolerances of CIP 223)
Siwtzerland isn't even part of CIP.
 
I ALWAYS load my rifle with what calibre it says to on the barrel.
.223 is fine for me!

*If I was in a race against a 5.56 however... I would just choose a lighter bullet... simple.
 
That was a painful read.... So I get that the general consensus is that I can fire .223 in a 5.56 chamber with the only issue being a possible/likely loss of accuracy. So my question is can 5.56 brass be reloaded using .223 dies and some of that accuracy potential be recovered? Or will the .223 dies muck up the 5.56 brass? Does anyone make 5.56 dies or quality brass? Can't find any with a quick search.

Sorry if the question is silly. I know nothing about reloading.
 
There are no 5.56 dies. Reload as you would .223. So much BS out there. 5.56 brass is not thicker for example. The load is a little hotter and the primers are crimped is the primary difference.
 
I posted this question on the savage shooters forum but it was shut down by the moderator so here goes:
First of all, Please don`t let this turn into a discussion about what cartridge fits what chamber. Looking for a first hand account of an actual problem.
I hear some stories about a cousins brothers neighbours uncles best friends daughters boyfriend etc, but I would like to find if there has ever been an actual problem.
I`m looking for a firsthand account of actual damage to a rifle barrel, bolt, chamber, action or injury to a shooter or bystander
I don`t mean to start a discussion or argument about firearm safety, gun manufacturer policies or warranties, case dimensions, chamber pressures or accuracy. Just looking for an actual account of damage from someone who saw it with his/her own eyes
 
gerard488 said:
I`m looking for a firsthand account of actual damage to a rifle barrel, bolt, chamber, action or injury to a shooter or bystander. Just looking for an actual account of damage from someone who saw it with his/her own eyes
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good luck, many have asked, no one has ever posted anything proving it is dangerous.
 
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