Soon to be owner of a 1916 DWM Luger P08 "shooter"

[DonVoigt]

Originally Posted by RShaw

Ahh OK,
I have never heard of such a thing.
.... Until now. Must be a term for that somewhere.

Anyway.... we're all learning

It is called a "failure"!

"Bullet core separated" from jacket is more technical.

Such separations happens to a very low % of bullets, and would likely be the primary cause for bulged barrels, JMHO. It was more prevalent in the earlier days of jacketed bullets, when mfg. techniques were not as good.

Happened pretty frequently when guys snipped or cut the nose of the bullet to simulate a "hollow point" ; especially with an open base bullet- the core would just "shoot" out.

A separated case is more common, but both do happen!