I don't know if I mentioned it, but I once stuck a magazine full of .380's into a magazine for my M39. First one fired, hit the target, etc., but wouldn't eject.
Figured it out when I saw the split case.
No gas, brass, etc., issues. I expect that the first round got grabbed by the extractor, which held it in place to fire, but then it lost connection with the fired case and that was that.
No idea where they are now, but the NRA (Rifleman) used to run an occasional "rifle rounds that only seem to interchange" sort of article.
The somewhat ancient brain also reminds me that during WWII the GI's in Australia found out that they could raise a burr on the head of a 9mm and shoot them in .38's for practice where .38Spl ammo was rare.
I know somebody who loaded and fired several handloaded .41 Rem Mags in a .44 Special Ruger Blackhawk. They keyholed into the paper target, which should have been the first clue. They were 230 grain Keith bullets and fairly long, and finally one of them was so long that it wouldn't allow the cylinder to turn another stop (it interferred with the frame at the bottom of the travel of the cylinder). The cylinder would back around part way but in the end the bullet had to be dremeled down in length to allow the cylinder to turn 360 degrees so all of the live rounds could be removed from the cylinder. But three of them had fired almost just fine. There is only .20 inches difference between a .41 (.410 inches) and a .44 (.430 inches).
Glad the OP posted his mistake. The moral of his story (and mine) is to check and double-check, and don't make assumptions...
Here's my mistake that could have been disasterous. Firing 7X57 Mauser, ALWAYS examine primer for signs of high pressure, noticed flattened primer, then noticed the case mouth was curved inward. Whoa Nelly.
UH OH, just fired a .308 through a .284 barrel. The combination of moderate handloads and the incredibly strong DWM model 1908. Mauser action likely prevented a Kaboom. BTW, that barrel had never been that clean. Not recommended cleaning technique though.
I sure hope a moderator comes by and closes this thread. It could still be read and new shooters can learn from it, but I do not think anything new posts need to be added.
Glad to hear you are ok. I'd bet dollars to dimes that no harm came to your gun from a 380 round going through it. A friend once gave me some loose 9mm that as it turned out, had a few Makarov 9x18 rounds mixed in and I almost made a similar mistake.
If you live long enough, s*#t happens and hopefully you learn from your mistakes and move on. I suspect even in the perfect world of the safety police where all are smiles and rainbows, they get their share of mishaps too.
Nice... I was trying to think of something witty, but couldn't top this.
OP, thanks for sharing. It is good to hear some are honest enough to admit errors. Maybe it will remind all of us how easy it can happen... Even to the ones balancing on the boxes of soap.
I realized my reply could be construed as rude or bashing.
I'm voluntarily removing it because everybody is stupid at times.(Myself included)
Being imperfect sucks.
A while ago someone posted on another website about mistakenly loading and firing a 9mm round in a Springfield XDM 45 acp. With the 9mm round chambered and thinking it was a 45 acp, he was confused as to why the loaded chamber indicator did not pop up. That made me realize why people say not to totally rely on "safety" indicators.
This happens more than people realize. One big reason why I shoot ONE caliber at a time. When I'm done with one caliber I put the ammo and the gun away and start with another caliber.
Got one better, before light, while hunting, shot a 30-30 out of a 7.56,, threw the rifle away, got a new pair of glasses to replace broken ones, needed afew bandaids, but I am still here, now I REALLY CK