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Posted: 3/22/2005 9:21:11 AM EDT
| What would you definately -not- shoot out of a 223 chamber vs 556? Brand and loading, or lot no's? Q3131A would seem to be out as it's a hot loading but... I don't really know. Sorry if it's a silly question but usually the only dumb questions' the one that blows u up cause u didn't ask :) |
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Read the first question here, okay newb.....: www.ammo-oracle.com opps sorry it's the 2nd question......  Mike ps - could have sworn you'd been directed there before......... 
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I did read there, quite a bit. However, it doesn't really say "dont shoot 556 in your 223" or anything. What I'm wondering is if there's particularly long, hot etc ammo I should stay away from or should I avoid 556 stamped rounds alltogether? Fine by me - winny white box is has worked well for me in the past. |
Duuhhh, 1. Dimensionally, 5.56 and .223 ammo are identical, though military 5.56 ammo is typically loaded to higher pressures and velocities than commercial ammo and may, in guns with extremely tight "match" .223 chambers, be unsafe to fire. 2. Opinion: In general it is a bad idea to attempt to fire 5.56 rounds (e.g., M193, M855) in .223 chambers, particularly with older rifles. 3. Fact: SAAMI specifically warns against the use of 5.56mm ammo in .223 chambers. The .223 SAAMI specification was originally made with bolt rifles in mind. 4. Though the AR15 design provides an extremely strong action, high pressure signs on the brass and primers, extraction failures and cycling problems may be seen when firing hot 5.56 ammo in .223-chambered rifles 5. Opinion: Unless you have a reason to seek out .223 Remington SAAMI spec chambers, 5.56 NATO is probably the best solution. 5.56 NATO chambers still can have outstanding accuracy and give you more flexibility in ammo selection. Excuse me, but I think you need to go back to school......, your read skills leave alot to be desired. Mike ps - all of this is where I directed ya to look for information. |
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Thanks for your wonderful insight into the issue. Your cut and paste skills obviously exceed my reading-while-the-boss-is-looking skills. Good for you. I actually have measured quite a bit of ammo. SEVERAL boxes marked as 556 have come out well within 223 spec. They may have higher pressure, though - but they also might not. Nothing says a factory has to load to max pressure! Nothing says a factory has to make rounds MAXIMUM 556 spec. They just have to chamber and fire safely, PREFERABLY reliably. My question, then was has anyone with a 223 chamber been using a particular lot or load of 556-stamped ammunition, and if so what have your results been? Thanks - |
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Sorry if I caused anyone any problems. I thought this was a simple question but suffice it to say I don't respond well to public insult when really, I don't feel it was called for. There are hate groups, religious forums, politics forums etc that do well with that kind of thing, and if that's what you're used to... Anyhow - thanks folks - I consider this a dead issue. |
| I see the AMU shoot 80 grain bullets. Pressure signs on the brass are extraordinary: super flat primers, brass bases with bolt impression, very visible ring around bottom of case web...and this is NEW Lake City brass. I asked what chambering they use (.223, 5.56, or Wylde): no comment. While I have seen bolt spline break due to super high pressure rounds, like the AMU 80 grain ones, I have never seen or heard of an AR blowing up from using 5.56 in a .223 chamber. I have not found a difinitive answer to your question. |
| hate to sound rude but if it's a .223 chamber then shoot .223 ammo! pretty straight forward. if it's a 5.56 camber either is fine. just remember that if you are reloading and using fireformed brass that was shot in a 5.56 chamber and it is not full length resized it cannot be used in a .223 chamber. all factory U.S. made ammo is made to SAAMI specs, even Q3131A. yes, i know Q3131A is manufacture is israel but it is to SAAMI specs. |
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Please explain this: excess head space causes excess pressure, gun blows up (or so I'm told!). Now you bunch of monkeys are telling me that the 5.56mm chamber, wich is cut LONGER, will cause LESS pressure with hot ammo. Why the fuck do we even worry about head space?hes |
The THROAT is cut longer, not the headspace. |
Hey man, whatever gets you thru the day. |
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