Jeff Siewert

And then the web distance, the distance between the back of the cartridge case and the interior cavity of the interior cartridge case was 0.122.

And other federal Smith & Wesson cases were 0.168.

So there's, you know, you're left with the conclusion, definitely high pressure.

Like, okay, and this happened on a very, let's just say, infrequent basis, okay?

So the brass yield strength is about 65,000 PSI.

estimate ultimate strengths around 95 000 again that's an estimate elongation of failure is about six percent and so the question is what the heck caused this failure okay and so i started scratching my head and i came up with this little silly idea uh on the upper left hand side is a before firing picture and it shows the the the cartridge a section of the cartridge

in the chamber, head space properly, and seated.

And there's a gap between the OD of the cartridge case and the ID of the chamber, okay?

And particularly if the cases are thin walled, you can run into this, okay?

And so on the right-hand side is during firing, what happens is the case wall mashes out and hits the chamber.

And now you've got this sharp corner

that is exposed to the bullet jacket, okay?

And particularly with plated bullets, not jacketed bullets, plated bullets.

So the plated bullets are kind of like, you can think of it as bullets

toothpaste in a tinfoil sack okay so the the you've got a very thin like four thousand thick plating of copper on it and because it's plated it's dead soft okay so you can't count on that

copper plating to provide any strength whatsoever so if that sharp corner is exposed to the jacket that thing's going to dig in and grab the bullet and it's going to cause the pressures to spike okay so it's that's what i believe and there might be other things like maybe the bullet got stubbed during the feed cycle and pushed more deeply into the cartridge case

And that helped to contribute to the high pressures.

But it's really the I think it's the the exposure of the the the copper, the copper to the sharp corner in the chamber.

You know, you go to Sammy, you look at those those chamber interfaces.

They don't say break the corner.