[ansel12]

My friend put one in a vice and shot himself in the knee when he hit it with a hammer, luckily he dug it out himself and never told his parents.

He is now a teacher and high school football coach.

[El Gato]

My friend put one in a vice and shot himself in the knee when he hit it with a hammer

The vise would have at least partially contained the pressure. Probably not completely and thus the bullet did not have anywhere near the same velocity as it would have coming out of the shortest revolver barrel.