Different Presentation: 223 -vs- 5.56: FACTS and MYTHS

[YeeHaa]

Full Story: https://bit.ly/2neNXAS Here it is! Essential facts and common misconceptions related to both 223/5.56 ammunition, as well as 223/5.56 rifles. Don't forget to check out the full write-up! (see link above).

 

[AR10ShooterinNC]

Thanks. Very good and well written article.

 

[pinkbunny]

TL;DR - chamber pressure differences are crap, but chamber differences do exist, and it's dangerous to fire 5.56 in 223 because the US uses weird bullets.

 

[Ikarus1]

TL;DR - chamber pressure differences are crap, but chamber differences do exist, and it's dangerous to fire 5.56 in 223 because the US uses weird bullets.

Unless its a mini-14

 

[AR10ShooterinNC]

TL;DR - chamber pressure differences are crap, but chamber differences do exist, and it's dangerous to fire 5.56 in 223 because the US uses weird bullets.

https://www.luckygunner.com/labs/5-56-vs-223/

 

[CZfool68]

But what about ma 223 Wilde?

 

[Ikarus1]

But what about ma 223 Wilde?

Its no Valkyrie

 

[CZfool68]

Its no Valkyrie

Good.

 

[DrPhudd]

I would not run .556 in a .223 chamber and I do fully understand the risk. I have never actually heard of any damage from doing so. Anybody have a link to any story where there was damage from doing this?

 

[pinkbunny]

I would not run .556 in a .223 chamber and I do fully understand the risk. I have never actually heard of any damage from doing so. Anybody have a link to any story where there was damage from doing this?

As I understand it, it would require mixing 5.56 tracer in with regular 5.56 cartridges. And then dipping all the rounds in grease before shooting to consistently raise the pressure to dangerous levels.

Don't know how common that occurrence is, or how many people shoot tracers, but I guess it's possible.

 

[Ikarus1]

Pretty sure most of the pressure differences on paper are in the measurement methods used by CIP (Nato) versus SAAMI.

Ive loaded .223 to 5.56 levels and vice versa using standard reloading data.

I will say that .300blk should not be used in a .223 wylde chamber.

 

[Tarowah]

I was told many years ago that if a Mini-14 has a single bladed front sight you shouldn’t shoot 5.56 through it and that those models were known to have accuracy issues but if it has the hooded fins around the front sight then 5.56 is fine to shoot through them, is there any truth to that?

 

[georgel]

I was told many years ago that if a Mini-14 has a single bladed front sight you shouldn’t shoot 5.56 through it and that those models were known to have accuracy issues but if it has the hooded fins around the front sight then 5.56 is fine to shoot through them, is there any truth to that?

I don't know the details of chambers or barrel configuration changes, but I do know that early models had an accuracy issue that was resolved in later models. I believe the earlier models were approximately 4moa guns.

 

[Ikarus1]

I don't know the details of chambers or barrel configuration changes, but I do know that early models had an accuracy issue that was resolved in later models. I believe the earlier models were approximately 4moa guns.

The later models had a cold hammer forged barrel (280 series and up IIRC) which increased accuracy....to 2MOA [emoji1787]