Bullets coming loose...

[Drail]

Setback - bullets driven deeper into the case in a semiauto. Bullet pull - bullet pulled out of case by inertia from recoil in a revolver (usually a very lightweight revolver). Crimp jump is sort a of meaningless term and is redundant - if a bullet moves either direction the crimp was "jumped".

 

[Walkalong]

Not meaning to imply otherwise--I was using "crimp jump" as a generic term

Gotcha.