Ar 15 chambers

ShotTaker

ShotTaker

New member
I have read and been told the difference between 5.56 NATO and .223 SAAMI. The question has anyone out there shot a 5.56 NATO thru a OLY. SUM barrel?Were the chamber pressures too high are was there no big deal? Survivors only reply please
 
No big deal as long as headspace is ok.
I have a question for you also, Hows the accuracy from the SUM and what Surplus are you shooting? Thanks, jerryboy
 
It is not recommended to shoot 5.56 in firearms chambered for 223 because of pressures. You may be able to do it and others have, but is it worth possibly risking your life or ruining your firearm. If you are going to shoot 5.56 then get a firearm that is chambered for it. It is just like 9mm, 9mm+P, or 9mm +P+ some manufactures dont recommend shooting the +P+. Only fire ammo that is designed for the firearm you are shooting. There might not be anything happen at first but somewhere down the line something is going to give, maybe while you are shooting or maybe another member of your family. How would that make you feel?
 
I'd call Olympic. The advice on being safe was good advice, but almost all the AR bbl chamberers and manufactures make both .223 and 5.56 chambers.
Theres a middle of the road in sizes called the 223 wilde or wylde. It's a little more accurate than 223 or 556. They work well without bad pressure spikes with all ammo.
They are so close in tollerances,Manufacturers dont bother mentioning it anymore. I'v fired 223 reloads in my 556 sum for years and not even as much as a flattened primer. jerryboy
 
I have shot "boat loads" of 5.56 ammo through SUM chambers. For years I did all of my feed/function tests with ball ammo. I don't have anything to gain or loose by saying this but I highly doubt that you can find a 5.56 loading that will touch the lands on a SAAMI chamber. I know the ones that I was shooting never did. That's the only thing you would have to be cautious of, making sure the ojive of the bullet does not touch the lands.
 
Here is another example. Take the 45-70 for instance. The factory loads you buy are loaded down because some of the firearms out there cannot handle the hotter loads that can be loaded for some of the modern ones. They are the same caliber but not designed to handle the hotter loads. A lot of the modern firearms are the same way. The best thing to do is call the manufacture and ask them. I did just that with Taurus, I was looking at the PT111 9mm and they were very clear to not shoot any +P or +P+ ammo in it. Only their revolvers are designed to handle the hotter loads. Ruger semi auto handguns will handle them. You will always get a lot of opinions so the best idea is to call the manufacturer. They know what their firearms are designed to handle. It is not worth getting injured because of something that someone else has done or because of someone elses opinion. The same goes for reloading. A load that will fire ok in one gun might be to hot for the next one.
 
I have fired 10's of thousands of rounds of this type ammo in all chambers and all rifles. Have never thought one thing about it. If it was not safe there would be a big red warning label on every rifle cause the lawyers would be having a field day on this one. Personally, don't think you will ever experience a problem. I think shoving a bullet back in the case during feeding would be more of a concern than 5.56 in a .223 chamber. I have seen this blow up several AR's in the past.
 
Here is a link to the SAAMI web page scroll down to center fire rifles. Look at the columns labeled (in rifle chambered for) and (do not use these cartridges).
http://www.saami.org/unsafe3.htm
I also have an email sent to Oly arms and will post it when I get it.
SteveM--You say- If it was not safe there would be a big red warning label on every rifle cause the lawyers would be having a field day on this one.
Here are a few
Ruger manual. It is in red
Ammuniton (Cartridges) Notice
We specifically disclaim responsibility for any damage or injuy whatsoever occurring in connection with,or as a resust of, the use in any ruger firearms of faulty, or non-standard, or "remanufactured? or hand-loaded ammunition, or of CARTRIDGES OTHER THAN THOSE FOR WHICH THE FIREARM WAS ORIGINALLY CHAMBERED.

Remingtons 10 commandments in manual.
5th commandment
Use proper ammunition
Every firearm is designed to use a certain caliber or gauge of ammunition. Useing the wrong ammunition, mixing ammunition or using improperly reloaded ammunition can cause serious personal injury or death.
 


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