9mm in 40 Caliber? Mmmmm....

[Hick]

Went out to the local range today and found a small pile of 9mm cases. Different headstamps but same primers-- so presumably a handloader. Looks like the shooter put the wrong ammo in the magazine and didn't notice right away. A couple of examples below (the case mouths measure at 40 caliber, but the brass is 9mm luger)

[johnsonian09]

How would that even line up to fire?


Sent from my iPhone using Tapatalk

[Bmi48219]

Used to see this frequently, the extractor grips case holding for firing pin to strike primer. Case always swells off center. A .380 loaded in a 9mm is pretty common to.
One time a couple kids showed up at the range with a box of 500 pcs. Berry’s 9 - 115 plated round nose bullets they were sold when they asked the gun store owner for 9 mm bullets.

[lar45]

That's a perfect opportunity for some education...

[Texas by God]

They were so silly. The 357 Sig works better.

Sent from my SM-A716U using Tapatalk

[reddog81]

How many cases were there? You’d think they’d notice after 1 or 2 at most.

[Bigslug]

Seen it many times. Inadvertently done it more than once. One of the hazards of an "industrial" setting with a lot of different pistols around needing to be fired. Scarier is when the round jumps the extractor and sits in the bore waiting for one of the proper caliber to be fired behind it after the "malfunction clearance" is performed. Seen one bulged .45 barrel from this

There's no mistaking a 9 for a .45, visually, or by feel, but since the .40 is right in the middle, the smaller rounds can end up in the bigger guns with fair regularity. Throw in all of these homebuilt pistols on which 9mm and .40 components can be largely interchanged, and the barrels may or may not be marked - - - I think the OP's photo is something we'll all be seeing a lot of.

[la5676]

IIRC, the specs are close enough that nearly all the die makers use the same shell holder for both 9mm and 40, so there’s that.

[Sasquatch-1]

I have seen this also. The thing is it is never 1 or 2 cases. It is 10 to 20 laying on the ground.

[DDriller]

IIRC, the specs are close enough that nearly all the die makers use the same shell holder for both 9mm and 40, so there’s that.

That is an incorrect statement. RCBS uses #16 for 9mm and #22 for .40 s&w

[Jaaymar]

I have seen this also. The thing is it is never 1 or 2 cases. It is 10 to 20 laying on the ground.

Will the 9mm generate enough rearward thrust to cycle the action in a 40?
It would make sense to me that it would not.
That would mean all those rounds would be from tap and rack clearances.
I would think after the second round not cycling the action they would investigate.

But maybe the lil 9mm will cycle the action even with so little contained pressure.

Jaaymar

[Hick]

How would that even line up to fire?


Sent from my iPhone using Tapatalk

The firing pin marks are right at the very edge of the primer--- like BMI says

[Hick]

How many cases were there? You’d think they’d notice after 1 or 2 at most.

I saw five-- just picked up the worst and another that was like most of them. Yeah-- you'd think it would be noticable after awhile.

[Mal Paso]

I heard put, put as I was passing station 15 and noticed they were keyholing at 10 yards with a 45 Single Action. I had a chat with the RO and he had sold them, what they asked for, 44Mag ammo. He went over and had a chat with them

We had another guy who just inherited a beautiful Browning, saw the 308 on the side and bought 308 ammo. He missed the Norma Magnum part. The cartridge fired and the bullet exited the barrel amazingly enough.

[la5676]

That is an incorrect statement. RCBS uses #16 for 9mm and #22 for .40 s&w

My shell plates for my progressive are for both 9mm and 40 S&W. Just sayin.

[ReloaderFred]

I've got samples of .22 LR fired in a .22 Magnum chamber, .380 ACP fired in a 9x19 chamber, 9x19 fired in a .40 S&W chamber, 357 Sig fired in a .40 S&W chamber and .40 S&W fired in a 45 ACP chamber. I've also got samples of .270 Winchester fired in a .30-06 chamber and .308 Winchester fired in a .30-06 chamber. These were all in brass that I purchased from the range.

Sometimes you really have to wonder.........

Hope this helps.

Fred

[stubshaft]

Darwin candidate...

[poppy42]

You’d be amazed at how many people think it’s ok or even a good idea to shoot 380 ammo out of a 9x18 Makarov! .380 uses a projectile with a diameter of .355. A 9 x 18 Makarov uses a projectile with a diameter of .364! Not quite enough to get a 380 case stuck in a Makarov chamber but it’s close!
I guess it’s not a bad as shooting a 300 blackout out of your 5.56 AR! That could have a Potentially fatal outcome!

[Rich/WIS]

Years ago two older gentlemen on the firing point down from me were having ejection problems with a 38 SPCL revolver. When ejecting the rims would slip over the extractor star. Checked what they were doing and discovered they were shooting 38 Super Auto in their 38 SPCL. Definitely a lot hotter load than 38 SPCL.

[Bmi48219]

I had a new to our range shooter and his girlfriend show up on a Saturday afternoon. I gave them the nickel tour and kept my eye on them for a while. Everything was going well until he cased the revolver and brought out an AR. Then the problems started. Fresh mag, bolt wouldn’t close the last 1/2”. He ejected and did it again, then again. I noticed the trouble as I approached. It’s nearly impossible to chamber a 300 BO in a 5.56 AR. Good thing too.