Can a 40 Cal round be shot in a 10 mm pistol safely? ( Mods relocate to better area if necessary)

[chilipeppermaniac]

In some of my tongue n cheek back and forth teases with Teratos about the ghey 40 cal I have, I saw some write-ups on how the 10mm was developed for FBI etc and nixed and the 40 cal was essentially the same dimensions and bullet. This led me to the question of similar ammo like 38 and 357, 44 M or 44 Special,,,,,,,,, etc.

I found this article.,

Why I Shoot .40 S&W Ammunition With My Unmodified 10mm GLOCK 20 Pistol - The Truth About Guns

&#9664Previous Post Next Post▶ First there was 10mm Auto. The FBI chose a watered-down loading — a 180 grain bullet at 975 fps instead of more like 1,300 fps — and a large-frame Smith & Wesson pistol through which to shoot it. By the time the contract went through, Tom Campbell, a S&W employee...

www.thetruthaboutguns.com

 

[RoadDawg]

Can a 40 Cal round be shot in a 10 mm pistol safely?​

Apparently, from your linked 2015 article, the answer is YES. IF it is a 10mm Glock pistol.

I believe that if there was a problem that anyone should be aware of… Glock corporation would have issued some kind of safety PSA by now.

 

[chilipeppermaniac]

Can a 40 Cal round be shot in a 10 mm pistol safely?​

Apparently, from your linked 2015 article, the answer is YES. IF it is a 10mm Glock pistol.

I believe that if there was a problem that anyone should be aware of… Glock corporation would have issued some kind of safety PSA by now.

It is food for thought and I am sure those here and elsewhere with real good minds that grasp of technical and real world actual cases of evidence, can expound upon further details and nuances.

I did find it rather interesting and with some sound logic. Look at a 22 SR, LR. No issues in shooting a SR in a 22 LR, just not the other way around.

 

[Bullfrog]

Unlike rimmed ammo (.38 special, 44 special), ammo for semi auto pistols headspaces on the case mouth. The .40 case is much shorter, so you are going to be relying on the extractor to hold the case solidly against the breech face.

This may lead to 2 issues... the first is light or unreliable primer strikes, since the case is only being held by the extractor and not by the chamber, which is longer than would be expected. I would not want to rely on it in a self defense situation.

The second is possible ejector wear or damage. I'm only speculating on this one, but you're asking it to do a job it wasn't designed for. Holding the case before firing is probably less stressful than withdrawing a fired case since during extraction it has to deal with friction from an expanded case and possibly a dirty chamber, so this may be a non issue.

 

[Bullfrog]

I did find it rather interesting and with some sound logic. Look at a 22 SR, LR. No issues in shooting a SR in a 22 LR, just not the other way around.

Those are rimmed cases that headspace on the rim, just like .38 and .44 special.

If you drop any of those rounds in the chamber, it is going to be in the correct position. If you drop a .40 into a 10mm chamber, it is going to fall down inside.

When you feed it from a magazine, it should be held by the extractor, but again that's not the way it was designed to work.


Just thought of a 3rd issue... if you fire a quantity of .40 at the range you may have an issue with built up debris in front of the too-short case. You may then have trouble getting 10mm to chamber properly until you have a chance to clean it out.

 

[chilipeppermaniac]

Another interesting take on things as Bullfrog mentioned.

 

[chilipeppermaniac]

Those are rimmed cases that headspace on the rim, just like .38 and .44 special.

Uhuh, the logic makes sense.

 

[Meditator]

Yes I have been shooting 40cal out of my 10 mm Glock pistols ( G20sf, G29, G40), using OEM barrel for years now. No issue!

It’s actually cheaper this way than shooting the normal 10mm practice rounds.

Recoil out of large frame feels like shooting 9mm, although in the long slide it felt like an eternity for the slide to cycle completely, just like shooting Glock 24.

 

[teratos]

Another interesting take on things as Bullfrog mentioned.

Put a small rock in front of the bullet to make it stick out more.

 

[SkiPatrolDude]

Yes, you can. But i'd only do it in a glock.

And you'd be surprised how many 10mm loads are loaded to 40cal spec. You actually have to do your homework with factory 10mm to see if it's actually giving you any power benefit over regular 40. I digress...

 

[Bullfrog]

Yes I have been shooting 40cal out of my 10 mm Glock pistols ( G20sf, G29, G40), using OEM barrel for years now. No issue!

It’s actually cheaper this way than shooting the normal 10mm practice rounds.

Recoil out of large frame feels like shooting 9mm, although in the long slide it felt like an eternity for the slide to cycle completely, just like shooting Glock 24.

Did you ever have a problem chambering 10mm after shooting a lot of .40 if you didn't clean the barrel afterward?

 

[joppaj]

I was sure that Ruger made a 10mm/ .40 convertible Blackhawk. I was apparently wrong. It was 10mm/ .38-40.

 

[Meditator]

Don’t know ,since I always clean barrel completely before going back to shooting 10mm again.

Although if I shoot 10mm , it will be full power load from Underwood or double taps.

 

[Bullfrog]

Another interesting take on things as Bullfrog mentioned.

I didn't think about the burning powder eroding the chamber in front of the .40 cartridge. That's a fourth issue.

Over time it may mess with the accuracy of your 10mm. When you shoot .40 you're basically making the chamber function like the forcing cone of a revolver. The bullet and unburned powder have to jump the gap. It wasn't designed for that.

 

[Bullfrog]

I was sure that Ruger made a 10mm/ .40 convertible Blackhawk. I was apparently wrong. It was 10mm/ .38-40.

Revolvers use moon clips, so you're turning them into a rimmed cartridge, like using .45 ACP in a revolver chambered for .45 colt or .45 ACP.

 

[chilipeppermaniac]

 

[chilipeppermaniac]

Revolvers use moon clips, so you're turning them into a rimmed cartridge, like using .45 ACP in a revolver chambered for .45 colt or .45 ACP.

This was also mentioned in a place I read or viewed.

 

[chilipeppermaniac]

Put a small rock in front of the bullet to make it stick out more.

Doc, I tried this trick on my lady while making whoopie.

She said she felt no difference when I used small Trojans Vs the Larger ones with a rock behind my pee shooter.

 

[RoadDawg]

Some folks are mentioning things which were covered very well in the article linked in the OP.

Extractor issues? Covered
Chamber wear? Covered
Primer strikes? Covered

In all mentioned items… none were any problem when shooting the .40 ammo in the Glock 10mm pistols.

 

[chilipeppermaniac]

Don’t know ,since I always clean barrel completely before going back to shooting 10mm again.

Although if I shoot 10mm , it will be full power load from Underwood or double taps.

190 or 230 gr Double Taps?