223 vs 5.56

[Great-Kazoo]

I have run mil 5.56 through every .223 marked bbl i own without any issues, to date. YMMV.

[spleify]

wikipedia as a source for reloading / ammo information? really?

223 and 5.56 are the same as are 308 and 7.62x51

just because it is on the internet does not mean that it is true. my info comes from people IN the ammo industry who know what they are talking about

Yeah, do you got a problem with that. Did you read it? Did you offer to supply any different or "better" info...? Nope you just want to complain about it.

If you have nothing positive to add please move along.

.223 and 5.56 are basically the same. I reload and have for more than 10 years. I load all .223/5.56 cases the same. I chronied 50 rounds of each .223 and 50 of 5.56. The pressures on average in all of the 5.56 cases vs. the .223 cases with the same powder charge, same primer and same projectile was 3fps faster on the 5.56 "at" the muzzle(on the chrony).

The fact that a 5.56 case has thicker inner walls allows you to load the cartridge "hotter" than a standard .223. Just simply taking a a 5.56 case and loading it does not necessarily make it hotter. It is just CAPABLE of taking a larger charge. That is all nothing more.

[00tec]

wikipedia as a source for reloading / ammo information? really?

223 and 5.56 are the same as are 308 and 7.62x51

just because it is on the internet does not mean that it is true. my info comes from people IN the ammo industry who know what they are talking about

I love how you bash his source, which actually lists the sources for its information on the page (and many are in the ammo industry), yet your information is better because your sister's baby daddy's cousin's girlfriend's ex boyfriend who worked for Federal in 1998 says so.

[Tim K]

wikipedia as a source for reloading / ammo information? really?

223 and 5.56 are the same as are 308 and 7.62x51

just because it is on the internet does not mean that it is true. my info comes from people IN the ammo industry who know what they are talking about

Who are these people? Really, I'm interested.

[spqrzilla]

wikipedia as a source for reloading / ammo information? really?

223 and 5.56 are the same as are 308 and 7.62x51

just because it is on the internet does not mean that it is true. my info comes from people IN the ammo industry who know what they are talking about

You are wrong. Both times.

5.56mm is not the same as .223 Remington. The differences between the specifications lie in the outer boundaries, and many times ammo is produced that meets both specifications, but that does not make them the "same". Likewise, .308 Winchester and 7.62x51mm NATO are different specifications. Again, a lot of ammo is produced that falls within both specifications, but that does not make them the "same".

[spqrzilla]

I have run mil 5.56 through every .223 marked bbl i own without any issues, to date. YMMV.

And I've run NATO spec 5.56mm through a .223 Remington spec target AR barrel and seen excessive pressure signs.

My mileage varied. That's why SAAMI warns against it.

[spencerhenry]

have you ever measure brass thickness? it is no different between the two cases. the only difference is the writing on the head. sure there are differences between different manufacturers, but military brass is not always thicker and commercial is not always thinner.

3fps difference? really, the margin of error of a chronograph is far greater than that. it is not possible to measure that accurately. the pressures were the same? do you have a transducer or some other pressure measuring equipment? velocity is an indicator of pressure, but does not necessarily denote pressure.
the only difference i can find between a 223 and a 5.56 chamber is the freebore or throat, but to say that it is a different chambering because of more or less freebore it absurd. old 264 win mags had long throats, my current manufacture such a short throat that i have to seat almost .060" deeper than max listed length to allow the round to chamber. different caliber? hardly
i have been reloading for 26 years, load for 42 different calibers including several that have very minimal load data, some that have NO load data available. i have run thousands of rounds of surplus 5.56 and 7.62x51 through 223 and 308 chambers and have NEVER seen an indication of excessive pressures.

[Whistler]

Took about a minute to find the actual chamber specs:

[spqrzilla]

Neat drawing, Whistler, as it includes the Wylde chamber spec as well.

[spleify]

3fps difference? really

Yeah, really! You just can NOT accept the fact that someone other than you and your trusted individuals "IN the ammo industry" might actually know something and test and study things, can you??

I did it simple and old school, it might not be on any high tech big dollar equipment just my little chronograph, I shot 50 rounds of each and took the average, that is where I got my numbers.

I was just about to post the same pic whistler did along with these as well.

Inner chamber is smaller, meaning it has thicker walls and floor, therefore allowing for higher pressures.

These discussions are on every single board and they are always so stupid and people always get all bent out of shape about things.