doublegunshop.com - home Forums General Discussion DoubleGun BBS @ doublegunshop.com Kemen blow up

The pictured MX2000 in Drew Hause's posting is a Perazzi, if I surmise correctly?

The originally posted Spanish Kemen (by Nitrah) is one that we can only speculate about, without pictures. Yet I would tentatively agree with dogon that a mere overload is less likely as cause, than a bore obstruction.

Carcano

I have the situation dogon describes happen with 410 shells occasionally. I always check carefully to make sure all of the hull has cleared the barrel

Having ejectors does not necessarily mean that the separation wouldn't have been noticed. I trap the ejected hulls in my hand as they clear the chambers. I would have noticed immediately that one of them was separated.

I do this in order to either pocket the empties on a hunt, or throw them in the trash can on a course. I'm always surprised that more people don't do this. It's so easy to learn.

A bit of a delay as the fotos arrived in my Spam Folder.....

Hochachtungsvoll,

Raimey
rse

Definitely an overloaded shell. Seen it before with firsthand knowledge of the cause.

Short of substituting the wrong powder, a wad in the forcing cone (I do not see a ring bulge), or a manufacturing defect, it is very difficult to rupture the breech of a modern quality O/U; likely > 50,000 psi
The pressure separated the breech at the monobloc, and was enough to fragment the breech.
This MAY have been DDT
http://www.trapshooters.com/threads/smokeless-powder-ddt.245629/

Smokeless shotgun powders CAN, under experimental conditions or with the use of a detonator, be made to detonate.
I have seen no article as yet documenting detonation using shotgun primers or in a shotshell.

Unfortunately a metallurgical failure study is likely to only show rapid deformation (not fatigue) with terminal cleavage, not the cause.
I would strongly urge the shooter to confirm the powder used, and send his reloads for pressure testing.
Did the hulls he was using have a separate base wad??