Thread: What in the world?

case head seperation, the reason the case has collapsed in the shoulders is when the front of the case becomes detached from the rim, it becomes part of the mass that is being forced out the barrel by the expanding gasses.
it is pushed forward untill the neck seals against the start of the rifled section of the barrel the gap inbetween the case and the chamber wall becomes a low pressure spot and the case collapses as the expanding gas is forced out the barrel, trying to force the brass case out the barrel. thats why it often takes some effort to remove the front half of the case, as it is wedged into the rifling. it is quite common to see.
Greg