Wrong Caliber /OVERSIZE Round Fired In 5.56 mm Rifle:

This picture is said to be of a sectioned barrel showing a .300 Blackout round that was fired in a 5.56 mm barrel.

Someone was very lucky that the heavy barrel didn't let-go /blow and cause serious injury ... but I'm copying it here as a further indication of the pressure applied to a projectile upon firing.

 - A mate commented previously that he thought my story in October about bullets being 'upset' and expanded when fired from a chamber - without a barrel to hold their shape "was a joke".. LINK:

https://flicense.blogspot.co.nz/2017/10/bullet-expansion-by-upset.html

No joke. This oversize .300 inch projectile has been squeezed-down to .223" and s-tr-et-ch-ed hugely by the gas pressure on firing. The "reformed " pill is now longer than the brass case it was squeezed out of!

Look At The Length Of  THAT Slug.

There is extreme force on the bullets base when it is fired and that pressure is what accelerates the projectile AND 'obturates it' by deforming it into the barrel where it is forced into a new shape made by the bore and grooves. 

If you remove that iron grip of the barrel - the bullet will shorten and expand from the hammer blow of the explosive force of high pressure gasses on it's base ..

.38" Slug Fired From Revolver WITHOUT Barrel.

Apparently that **300 /.223 kaboom** blew out the magazine and stuffed the rifle's action - but didn't permanently reshape the shooter.

All of us hand-loaders & shooters need to be reminded of the forces that we are working with.

Marty K.