That appears to me to be a round fired behind a squib.
If it was a powder/overcharged/wrong powder round with no obstructions in the barrel, most of the gas/pressure would be released behind the chamber and through the upper.
Who was the ammo manufacturer? You've named DD, why not the ammo?
Scoby
“Laws that forbid the carrying of arms disarm only those who are neither inclined nor determined to commit crimes. Such laws make things worse for the assaulted and better for the assailants; they serve rather to encourage than prevent homicides, for an unarmed man may be attacked with greater confidence than an armed man.” –Thomas Jefferson, quoting 18th century criminologist Cesare Beccaria in “On Crimes and Punishment”, 1764
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