Virginia Gun Owners Forum - VGOF

Don't try tis at home kids. Accidently mixed a 9mm cartridge with my .40 S&W. Found it on the firing line today. Not good. I guess the lower pressures made it so it didn't do damage and the 9mm round hit the target center mass, which shocked me, but I wouldn't try it again. LOL

I have seen this before, a shooting buddy of mine has a Glock .40 and a 9mm. Some how a 9 mm mag. got loaded into his.40 . It actually fired and cycled several times and then Jamed . Luckily know one was injured, but the gun needed a little TLC .

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Wow! He is very lucky. I can't imagine its good for the gun, possibly messing up the leade and the rifling, etc.

I heard the shot was very weak, so I stopped shooting. I watched the brass hit the floor and it looked like it was dented, so I picked it up. Needless to say, I check every last round I had with me. I pulled the weapon apart and gave it the once over. It looked good and I ran 100 rounds through it with no issues.

Had a 9MM in the magazine of my .40 and it jammed rather than loaded and fired. Guess I was luckier

Oh yea.

May want to have the rifling/barrel looked at by a gunsmith.

I was thinking about that. I didn't see anything that jumped out at me... but I don't know what to look for if there is no obvious stress marks. My regular shop was closed today... but possibly tomorrow. Its in the safe for now.

Happened to me a few years ago in a XD... don't recall if it FTE or I heard the difference and stopped. Gun was fine. Run another thousand of the right ammo to test it. Mine still shootz...

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ProShooter wrote:May want to have the rifling/barrel looked at by a gunsmith.

Why? The diameter of a 9mm bullet is ~.355" and the .40 cal. bullet is .400. Even given that barrel bore diameter is always slightly smaller than bullet diameter I doubt that the 9mm bullets even touched the barrel but lightly. Also, I assume the bullets were jacketed so leading wouldn't be a problem anyway.

Just IMHO.

Did you ever wonder how a loose round in the chamber can be hit hard enough to set off the primer....while a primer not seated deep enough is supposed to cause a misfire as the firing pin just pushes the primer farther into the pocket when it hits?

I've loaded .40 S&W ammo into 9MM magazines and fired it in my pistols just to see if I could use 9MM magazines. It sits a little "deeper" in the magazine but seems to feed fine.

I have not tried to load 9MM ammo into a .40 S&W magazine. But it seems it would sit higher in the magazine (at the feed lips) and maybe be easier to fall/pop out while handling it.

FWIW, The SAAMI "dangerous combinations" manual suggests that it is unsafe to shoot a .40 S&W in a 9mm chambered gun.

...uhmm... Well now... I suppose that, should you manage to get it chambered, it likely would be dangerous!!!

MarcSpaz wrote: Accidently mixed a 9mm cartridge with my .40 S&W. Found it on the firing line today.

Easy there, Kimosabe! Glad you're alright.

LOL! Thanks Mike. I really need to pay more attention to what I'm doing. Things could have been worse.

I had the idea, a while back, to limit my firearms to particular calibers. This is part of the reason why.

Glad things worked in your favor, Marc. And, I appreciate the reminder to pay attention.

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Thanks H!