The .380 is the same as a 9mm, but a shorter casing. The Germans call it the 9mm kurtz. Is that what the nano 9mm is? I like the .380 because it is not as powerful as a 9mm. In short quarters, a hollow point .380 should take care of business without going through the perp and hurting someone on the other side. BTW, I use a SigSauer P232. Very nice mid size that is slender so is comfortable without bulk.