Today at a local gun store I saw a .380 semi auto pistol that was just over 6" in length and weighed 20 oz.

When I picked it up I was surprised to see that it was .380. For its size why wouldn't someone prefer a larger caliber? What is the benefit of .380 in this size pistol? For same size one could have a 9mm, .40 or.45?

Guess I was assuming self defense. is there another use for this large .380 besides self defense?