Originally Posted by Skans:
About the .380 round, I never could figure out why there are no "super-capacity" .380 handguns out there. I bet you could get 20-30% more cartridges in a magazine compared to 9mm. That means we really should be seeing 25 round, full-sized .380's. Now, that would be something I would be interested in!
Since the .380 and 9mm cartridges are the same diameter, both cartridges will occupy the same magazine volume equally. IOW, a 15 round 9mm magazine could hold no more than 15 rounds of .380.