shell-case

He opened the cylinder and shook the empty shell case out.

There simply isn't room in the smaller shell cases for enough steel pellets of the proper size.

There was a square shell case over her shoulder.

The idea was to get the second round off before the first shell case hit the ground.

Then he tracked around the gulch and picked up all eight spent shell cases.

It just isn't possible to get enough steel pellets of the proper size into those small shell cases.

"The shell case has got fingerprints on it," he said.

To connect it with the shell case, which he probably also left there on purpose.

On examination he had found that they were spent shell cases.

Guys who put two bullets in the head, with a silencer, then collect up the shell cases, they're a different class of person.