[Newton]

It was as much my fault as his. I switched lanes with a friend I was shooting with and my lane had several guns and ammo types ready to go. He got a little confused and was merrily shooting 9mm out of my .40 caliber Beretta 9000F. The 9mm cases had expanded alarmingly but hadn't split.

Fortunately he had only managed 2 or 3 rounds before I noticed something wasn't right. A quick disassembly revealed no damage, and I proceeded to shoot a nice tight group with no gun related problems of any kind.

A thorough cleaning back at home revealed nothing unusual, and I can detect no damage of any kind.

Anything I'm missing here, I've heard others tell of trashed barrels after one round, but this seems unlikely.

Newton

[Chugach]

As long as the rounds were fired with the action in battery (sounds that way) and your extractor is still working well, everything is probably OK.

Check with gunsmith if you really want to be sure.

[firestar]

Was it functioning with the 9mm ammo? Was it feeding and ejecting them? If it was, I am very impressed that the Beretta would do it.

[benewton]

Did the same thing with a SIG, 9mm in .40.

As memory serves, it didn't eject right, and the brass looked really blown out, but I can't see any reason that it'd damage the weapon.

After all, the pressure would be less with the 9mm due to the larger chamber.

I'd worry, if I did at all, about the barrel. After all, the sub caliber round bouncing down the bore just can't help accuracy!

[Newton]

My test group fired after the quick inspection was actually the best group I have ever shot with that pistol.

The gun functioned perfectly for the first few rounds, shooting, ejecting and chambering perfectly, the problem became apparent when a round failed to fire presumably because it had slipped past the ejector and was out of reach of the firing pin.

I'll be watching the performance from now on, and any problems will have me taking the gun round to Beretta who are just down the road from me, doubt I'll mention the 9mm incident though ;)

[ICP_juggalo]

You can do the same with a .380ACP in a 9mm pistol. I have shot about a dozen or so .380 rounds out of my 9mm Ruger some time ago. They will cycle flwalessly, but the slide wont cycle automatically between each shot cause the .380 doesn't produce enough recoil and pressure to cycle the slide automatically. As far as the bullet goes, both the .380ACP and 9mm Luger shoot the same .355 diameter bullet. The .380 just shoots a lighter bullet. You do get a little blowback though around the .380 cartridge when you fire it in a 9mm chamber, but I thoroughly inspected my Ruger afterwards and there was no damage to the pistol. Don't try the reverse though. Even if you are able to chamber a 9mm round in a .380 pistol, the higher pressure of the 9mm will rip a .380 pistol in half.






"Everyone is your brother until the rent comes due."

[Shake]

Shot better afterward huh? Hmmmm. . . maybe I should . . .

Never mind:D

Shake

[TonyB]

A guy at IDPA shot 9mm in his Glock 40cal. one night.....kinda went pop....and the hole in the target was oblong.....he knew something was wrong but shot agian....then he took his mag out and discovered he had the wrong ammo and magazines(his usual gun is a 9)didn;t hurt the gun,just his ego.:cool:

[pingwax]

An instructor at a handgun safety class I took told a story similar to this. In that case, though, the shooter shot over 70 bullets through the gun (a glock) before finally asking somebody at the range to help him figure out why it wasn't feeding properly.

Unfortunately, it did damage the barrel; the instructor said that he could see little dings and dents in the rifling of the barrel.

In this case, the shooter had borrowed the gun from a friend that he was meeting there later. No word on what his friend had to say...

[Matthew_Q]

A 9mm round will chamber in a .40 in a good enough position to fire??


What does it headspace on? Does it line up with the firing pin?

[bountyhunter]

Sounds like you came up with a great way to reduce the ammo costs when I shoot my .40 guns.:eek:

[bountyhunter]

A guy at IDPA shot 9mm in his Glock 40cal. one night.....kinda went pop....and the hole in the target was oblong.....he knew something was wrong but shot agian....then he took his mag out and discovered he had the wrong ammo and magazines(his usual gun is a 9)didn;t hurt the gun,

We 've been using that trick for years to increase our scores..... that tumbling bullet really increases the hole diameter!

[Erik Jensen]

I had gotten totally cheesed when I had a federal hydrashok that wouldn't fire in my Kahr MK40. fed fine, just went click when I pulled the trigger, so i pulled the slide back a little to reset, and pulled again. nothing. extracted the cartridge, continued on my merry way. came out, showed it to one of the employees, because I was amazed that a brand new federal HS would be a dud. then he pointed out that the primer strikes were really far apart, and that it was marked 9mm Luger. I must have dropped a round into the wrong box. oy.

[Al Thompson]

Ran six .41 Mags through a .45 Colt once. :rolleyes: Wish I'd kept the brass.

[Newton]

Matthew

In this situation the round doesn't headspace on anything, it is held in place by the extractor alone, otherwise the force of chambering a round would likely send it sliding down the barrel and oot t'other end.

[bdhawk]

how would a .40 s&w do in a 10MM?