Last week I was busy but wanted to squeeze in some range time. I loaded what I thought was 9MM ammo in my range bag, rushed to the range and to my assigned lane. Put ammo in magazines using a speed loader, inserted the magazine into my 9MM -one shot then nothing. Did all of the emergency procedures, fired once then again- nothing I did this through a entire magazine. I thought something was wrong with the gun, put it back in the bag and pulled out the .380. When I got home it dawned on me that I was trying to fire .380 ammo thru the 9MM. On top of that I was testing SD ammo for the LCP2. So I fired all of my .380 ammo. I didnāt realize until this week there is an ammo shortage, so I have no SD .380 ammo but I have SD 9MM ammo 
so my single stack 9MM will be my summer carry. 
Well, you already characterized it as dumb, so Iām gonna spare you the lecture and move to the advice.
Slow down and pay more attention. If you donāt have time to double check details during any loadout, you are moving too quickly and/or not keeping your head in the moment. Either one can get you killed and will definitely make you less efficient and effective.
Hope it helps!
Dr. Ken Morrow
P.S. What actually made me decide to respond was the fact you shot ALL of the .380 without self-correcting. ???
Hey brother it happens to the best of us. No hassles but I gotta 
Slow down and never go so fast that you cant pay attention. In this case, you end up just feeling embarrassed. There are some cartridge/gun combinations that can result in a lot worse consequences than failures to fire. Take it as lessons learned and be happy your firearms are still in good condition as is your hands, face, and body. But based on this, how much have you taken the lessons to heart? What are you changing in your get ready for the range process and your range practice routine to make sure this doesnt happen again?
My first thought at reading the subject line? I do at least two dumb things before I finish my morning coffee every day.
@Denny_Crane - Iām just glad you didnāt get hurt.
@Denny_Crane, I would recommend a visual inspection of the chamber and the bore of the 9mm barrel the .380 was shot in. Since you were shooting hollow points I can theoretically envision one brushing the edge of the chamber and bouncing back and forth becoming realigned as it goes down the barrel. If it did, then some minor damage could have taken place that ācouldā affect accuracy in the future.
On the other hand, maybe somebody that knows can speak up and say this was similar to shooting .38 thru a .357 and therefore no big deal.
It IS fairly similar to the .38 to .357 comparison, but not the same; mostly because you are talking about revolver vs semi-auto loading pistols.
Iām with you.
The First fail to fire is a BIG hint to slow down and understand exactly whatās not āright.ā Even if it is ājustā a dud round, youāve done due diligence.
Toward the second point, 38spl in 357 or 380 in 9; you might have a bit of fouling which could affect proper seating/head spacing in the firearm.
Lesson learned the hard way. Slow down. Stay safe.
I once owned a Single Six Convertible.
I was having so much fun I didnāt notice I was shooting .22LR on .22WMR barrel.
I have a .357 mag revolver and lever action rifle. And I do some times shoot .38 spl or .38 +p in them with no problem. But it would be a different story if the guns were semi-auto. And it would be because of size of the ammo and shell cases. But in Revolvers or lever action none at all that Iāve seen by doing it. But it cannot be done with .357 mag shooting in a .38 spl or a .38+p. And that is because the .357 mag ammo is longer than the others. Glad you werenāt hurt.
Making sure you have the correct ammunition for your firearm is one of the 10 Commandments.
Thatās a tough way to learn a lesson. Iām glad no one was hurt!
Thatās why all of my handguns are .45, no confusion over what I am needing 
As a new handgun guy, I am thankful for this thread. Glad to see you didnāt get hurt. This is a good lesson to people like me . Thank you for sharing.
Iāve only had something similar happen once. I was tuning up a buddies 9mm 1911 and I guess I missed one of his mags in the bottom of my bag. I slapped it home in my 45 1911 and sent the slide forward and the barrel spit out a live 9mm onto the table. That one took me a minute to figure out what I had done.
Cheers,
Craig6
As has been said, slow down, pay attention. It could have been much worse. Many moons ago all shotgun shells from a given mfgr were the same color (Winchester=red, Remington =green, Peters High Velocity =blue. All was good EXCEPT some folks with multiple shotguns would wind up loading a 20 gauge into a 12. Shell would go forward of the chamber and lodge. A12 gauge then loaded and fired would blow up the shotgun rather spectacularly! And that boys and girls is why all 20 gauge shells sold now are Yellowā¦ Same thing can happen with other weapons if ammo gets mixed. Take your time, always, and be SURE the ammo matches the weapon.
Been there and done that. Good to know that you figured it out.
Does anyone remember the movie Survivors with Robin Williams and the scene with Jerry Reed. āJack I brought the wrong bulletsā and āwhat kind of guy gives cigarettes to treesā
Glad you are safe1 Since we are all human, and make mistakesā¦
Two words . . . situational awareness. Be mindful of what you are doing at all times.
Just make sure you vote for the person you intended to at the ballot box. Iām not going to tell who to vote for but please donāt vote for Kanye West 