Smaller bullets would mean fewer gun deaths.

Earlier this week, the New York Times reported on a study that found the size of a bullet was the key factor in whether a shooting victim lived or died.

"If all the shooters in Boston had used the types of guns in circulation with the biggest bullets, the homicide rate could have been 43 percent higher, the researchers calculated recently, even with the same people committing exactly the same crimes."

Here's the study: