https://www.shootingillustrated.com/...S-IY4.facebook

Some pretty interesting stuff there.

Excerpt:
About this time, several people began to study the role of the bullet in stopping an attacker and to attempt to develop better bullets for the job. Chief among them was Lee Jurras. He began by designing bullets that had a softer lead core and a thinner jacket in order to increase expansion. Jurras also discovered that, if he used lighter-weight bullets, he could increase the velocity in a given caliber without increasing the pressure beyond safe limits. Jurras found that these lighter, faster bullets were more inclined to stay in the body of the criminal instead of exiting and causing danger to others.