[Jagermeister]

Really, that statement made my day. Funny. I have seen a guy actually damage his gun that way. People believe certain myths about guns. Oh here is another one, I heard that a .45 will stop a man even if you shoot him in the ear. Anybody else have some myths about guns.

[BULLET9992]

There is this crazy myth going around that they are inherently evil & have been known to kill themselves with no operator.

[Jpyle]

Originally Posted by 45JMB

I know that a M16 fires the 5.56x45 but AR15 fires the 5.56x39 right? Which is known as .223

The Remington .223 and NATO 5.56 x 45 are essentially the same round. There are differences that limit use of a 5.56 in a .223 chambered barrel but the case length is the same at 45 mm. 5.56 x 39 is not a typical AR round, you may be confusing it with the 7.62 x 39 round used in an AK-47 or the 5.45 x 39 used in the AK-74.

[Apex-Predator]

Originally Posted by Jagermeister

Really, that statement made my day. Funny. I have seen a guy actually damage his gun that way. People believe certain myths about guns. Oh here is another one, I heard that a .45 will stop a man even if you shoot him in the ear. Anybody else have some myths about guns.

Yep, my favorite is the one about how a 30-06 drops downrange and then comes back up again, but only 30-06s do it LMAO heard that one several times over the years.
I had a debate with my boss about that one, I tried to explain to him that bullets don't come out of your scope, but he does not get it, and not he can't shoot.

[JWagner]

I do not know how much you trust Wikipedia, but here is their take on the .223/5.56 comparison:

http://en.wikipedia.org/wiki/.223_Remington

[locutus]

The .223 uses a .224 diameter bullet. Just like the 5.56X45.

The 5.56 MM chamber has a longer leade to accommodate the longer special purpose rounds like tracer. The 5.56X45 cases have thicker walls and a heavier web to handle the increased pressure of the military round.

5.56X45 is loaded to pressures well over 60K PSI. Commercial .223 Remington is loaded to no more than 55K PSI.

No matter what someone on the internet tells you, DO NOT USE MILITARY 5.56X45 AMMO IN A COMMERCIAL .223 REMINGTON CHAMBER.

There is a difference, and anyone who tells you otherwise does not know what the hell he's talking about!

[montveil]

The 223 chamber is slightly shorter than the 5.56 and caused the 5.56 bullet to "jam in a 223 chamber causing higher and dangerous pressures.
A 5.56 can fire a 223 but not the reverse.
I got some Winchester frangible bullets ( they are made to powder upon impact) and fired them through my 223 and they just blew apart in the barrel causing nothing but powder to exit the barrel.
I was a real wake up call for me as to what was happening and what might happen with a full metal jacket bullet.

[JTJ]

Originally Posted by 45JMB

Thanks a lot guys. It's just because people said that the .223 and 5.56.39 Are totally different rounds.

THERE IS NO 5.56X39!
The NATO military cartridge is the 5.56x45.

[Apex-Predator]

"The 223 chamber is slightly shorter than the 5.56 and caused the 5.56 bullet to "jam in a 223 chamber causing higher and dangerous pressures."

Not true, 223 and 5.56 have the exact same SAAMI specs as far as external measurements go (just not pressure). If you are talking about the lands of the rifling that varies from rifle to rifle.

[jpattersonnh]

Originally Posted by locutus

The .223 uses a .224 diameter bullet. Just like the 5.56X45.

The 5.56 MM chamber has a longer leade to accommodate the longer special purpose rounds like tracer. The 5.56X45 cases have thicker walls and a heavier web to handle the increased pressure of the military round.

5.56X45 is loaded to pressures well over 60K PSI. Commercial .223 Remington is loaded to no more than 55K PSI.

No matter what someone on the internet tells you, DO NOT USE MILITARY 5.56X45 AMMO IN A COMMERCIAL .223 REMINGTON CHAMBER.

There is a difference, and anyone who tells you otherwise does not know what the hell he's talking about!

There is a difference, but upon weighing different 5.56x45 rounds, there really is not thicker brass, they would weigh more. The 5.56 chamber is a little more , here comes the bad word, Liberal, not quite as tight. One issue you may find on researching the pressure is that sammi uses 1 method, Nato another. As far as the leade, you are correct, but that is also to aleave pressure spikes.

Originally Posted by montveil

The 223 chamber is slightly shorter than the 5.56 and caused the 5.56 bullet to "jam in a 223 chamber causing higher and dangerous pressures.
A 5.56 can fire a 223 but not the reverse.
I got some Winchester frangible bullets ( they are made to powder upon impact) and fired them through my 223 and they just blew apart in the barrel causing nothing but powder to exit the barrel.
I was a real wake up call for me as to what was happening and what might happen with a full metal jacket bullet.

interesting, Winchester makes .223 frangable. Sure it was not the user??

Originally Posted by Apex-Predator

"The 223 chamber is slightly shorter than the 5.56 and caused the 5.56 bullet to "jam in a 223 chamber causing higher and dangerous pressures."

Not true, 223 and 5.56 have the exact same SAAMI specs as far as external measurements go (just not pressure). If you are talking about the lands of the rifling that varies from rifle to rifle.

+1


Even among manufacturers the 5.56, or Wylde can have many variances as far as chamber cuts.