Here's a picture of wrong ammo shot in handguns for a learning tool. From the left to the right .32 auto shot in a .35 S&W 9 m/m shot in a .40 S&W .40 S&W shot in a .45 auto .32 H&R mag shot in a .38 spl 9 m/m shot out of battery? The 32 I'm sure about as the guy who shot it saved an empty for me. The rest were found and I guessed at what happened. In each case the extractor held the case tight enough for the gun to fire. You can easily see how much stronger the cases are at the base. No expansion at base. The 9 m/m that I think was out of battery is the only one I'm not very sure about. What 9 m/m would fire with the action open that far? Any other guesses? I don't think any of these harmed the gun or shooter.