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Old 09-20-2012, 15:47   #26
GGGN
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Shot thousands of 40 through my 10's over the yrs. but I also have a few pics of guns blown apart from doing so.(not mine) so to each his own.
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Old 09-20-2012, 16:44   #27
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I shoot 12 gauge 00 Buck from my G20 so there! No way I'd fire sabot slugs though. That would just be stupid.
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Old 09-21-2012, 11:39   #28
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I've been gone for a short minute... I have been hanging out over at M4Carbine.net lately.

All of that aside, some of us have been saying for years, it is possible to discharge .40S&W cartridges in a stock Glock 20 barrel, but is not recommended.

http://www.glocktalk.com/forums/showthread

and just a little farther down in that same thread...

http://www.glocktalk.com/forums/showthread

These links above are not the first time it has been said, but we always try to tell folks to be careful because it can be dangerous. Carry on.

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Old 09-22-2012, 00:03   #29
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Secondly, extractor abuse. On about 1 out of 5, the case would slip out of the extractor upon primer strike, and was forward inside the chamber. What this tells me is that a live round could slip past the extractor during the engagement of the striker.
I could be wrong, but I'm not convinced this is what was happening for you. Maybe the force of the primer ignition was pushing the case forward past the extractor; this is much more likely that the striker itself pushing the case forward.

I have never experienced this with loaded ammo in the Glock. Not saying it can't happen, but empty primed cases don't tell the whole story.

Of course, maybe there's something wrong with your extractor. With a properly working extractor, a round should not be able to slip past it without ripping off part of the rim. Not going to happen from the striker impact.

Either way, if the round gets in front of the extractor in a Glock, it will not fire.

Last edited by Yondering; 09-22-2012 at 00:05..
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Old 09-22-2012, 00:15   #30
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Why not just get a G22/G23 if you want to shoot 40S&W....

Or is that too obvious of an answer?
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Old 09-22-2012, 00:23   #31
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Why not just get a G22/G23 if you want to shoot 40S&W....

Or is that too obvious of an answer?

Cause they cost $500-600 and you can't shoot 10mm out of them.


I've shot .40 out of my G20 and it works fine but I don't do it on a regular basis. I reload so it's just as easy to reload 10mm as it is .40.
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Old 09-22-2012, 17:31   #32
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I could be wrong, but I'm not convinced this is what was happening for you. Maybe the force of the primer ignition was pushing the case forward past the extractor; this is much more likely that the striker itself pushing the case forward.

I have never experienced this with loaded ammo in the Glock. Not saying it can't happen, but empty primed cases don't tell the whole story.

Of course, maybe there's something wrong with your extractor. With a properly working extractor, a round should not be able to slip past it without ripping off part of the rim. Not going to happen from the striker impact.

Either way, if the round gets in front of the extractor in a Glock, it will not fire.
I appreciate the comments. My extractor is 100%. The whole thing was strange to me, and it was a bit of a chin scratcher. Brass was not ripped in any way either. I would buy that the primer ignition was the cause, but I found at least a couple of rounds forward of the extractor unfired with light primer strikes. I had about 300 rounds that I discharged, and I was surprised at the weird stuff I saw. I do believe that with the inertia of heavier loaded ammo there could be different results.
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Old 09-23-2012, 01:42   #33
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You can do it, but I decided to play it safe and for under $120.00 I got a Lone Wolf .40 barrel to shoot cheaper .40 ammo.
*Note*
So far I usually just get the cheap 10mm ammo at the range and don't bother with the .40.
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Old 09-23-2012, 05:03   #34
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Why not just get a G22/G23 if you want to shoot 40S&W....

Or is that too obvious of an answer?
Not at all. Either that or just get a .40 conversion barrel.

I guess the only upswing of knowing you could fire .40 ammo out of a 10mm is as mentioned above by nicke10, if you are in a pinch. Take an extreme example...say I was on a hunting trip up in Alaska and stranded somewhere with no 10mm ammo, and the only thing I could scrounge up was some .40 I found in a cabin, it's good to know I could use the .40 ammo in my Glock 20.
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Old 09-23-2012, 10:39   #35
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Not at all. Either that or just get a .40 conversion barrel.

I guess the only upswing of knowing you could fire .40 ammo out of a 10mm is as mentioned above by nicke10, if you are in a pinch. Take an extreme example...say I was on a hunting trip up in Alaska and stranded somewhere with no 10mm ammo, and the only thing I could scrounge up was some .40 I found in a cabin, it's good to know I could use the .40 ammo in my Glock 20.
I like the idea. A 9mm will rattle it's way out of a G23 but just doesn't cycle the action... yeah I know that one first hand

But I'm still a little leery of purposely feeding .40 through a G20. I will stick with the .40 cal in my G22 & G23 and leave the 10mm to well... 10mm Haha.

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Old 09-23-2012, 11:12   #36
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I like the idea. A 9mm will rattle it's way out of a G23 but just doesn't cycle the action... yeah I know that one first hand

But I'm still a little leery of purposely feeding .40 through a G20. I will stick with the .40 cal in my G22 & G23 and leave the 10mm to well... 10mm Haha.

LOL that must have been fun.
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Old 09-23-2012, 11:39   #37
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What would happen in the full size G20 barrel?
The gun will fall asleep from sheer boredom.


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Old 09-23-2012, 13:23   #38
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[quote=sheriff733;19448552]The gun will fall asleep from sheer boreddom.




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Old 09-23-2012, 16:11   #39
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LOL that must have been fun.
It was 11 years ago and yeah it had a pucker factor to it. The casing completely heat fit to the chamber and it was a very odd looking round when it ejected. Kind of like a reverse top hat.

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Old 09-23-2012, 21:44   #40
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Not at all. Either that or just get a .40 conversion barrel.

I guess the only upswing of knowing you could fire .40 ammo out of a 10mm is as mentioned above by nicke10, if you are in a pinch. Take an extreme example...say I was on a hunting trip up in Alaska and stranded somewhere with no 10mm ammo, and the only thing I could scrounge up was some .40 I found in a cabin, it's good to know I could use the .40 ammo in my Glock 20.
4949, that's a friggin' hilarious image. Stuck in a snowbound Alaskan cabin, nothin' but dried out biscuits, some hard deer jerky and... some loose .40 ammo lying around. I got a good chuckle outta that one. You might not be too far off the mark though, Alaska State Troopers carry the G22 so there's bound to be some Short & Weak lying around.
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Old 09-24-2012, 13:20   #41
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4949, that's a friggin' hilarious image. Stuck in a snowbound Alaskan cabin, nothin' but dried out biscuits, some hard deer jerky and... some loose .40 ammo lying around. I got a good chuckle outta that one. You might not be too far off the mark though, Alaska State Troopers carry the G22 so there's bound to be some Short & Weak lying around.
LOL Opie1 I must have too much time on my hands to think this stuff up.
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Old 09-25-2012, 10:49   #42
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This. 10mm headspaces on the case mouth, running a 40S&W case in a 10mm chamber means that the extractor is the only thing holding it in.
don't worry, soon will see "my extractor broke"
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Old 09-25-2012, 10:55   #43
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I understand that 10mm costs a lot more than 40SW, but if you are only going to shoot 40SW out of a 10mm Glock, why not just buy a 22/23/27?
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Old 09-25-2012, 11:34   #44
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Speaking for myself I'm not going to shoot .40 exclusively. But until I get around to being a reloader, this gives me a lot more shooting time with this g29 than I otherwise would have. I bought the gun used with a bunch of bells and whistles and I've added a few things too and now I just like shooting it.
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Old 09-25-2012, 16:28   #45
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A quick thought experiment tells me that the extractor is the only thing holding the cartridge against the breech face.

But if it works, do it.
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Old 09-25-2012, 18:03   #46
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Not true. The case mouth is only a limiting factor. Your 10's still space off the extractor, unless the case is long enough to hit both (about 1.002"). As the slide/breach picks up a round from the mag, it slides up the breach, and under the extractor.
Not hardly.

But, if that's what you believe, precede. The extractor was never designed to hold the case against the breach face although shooting the short cases takes advantage of the extractor to breach dimension relationship. Possibly the manufacturer should just eliminate the final machining of the shoulder in the chamber altogether under the premise that it is unnecessary. I mean, there is no need to regulate case length and the COAL length could be limited by the rifling in the leade.

When I see Glock (or any other manufacturer for that matter) say that it is acceptable to shoot ammunition in any gun for which the gun is not chambered, I'll buy into it. Until then, this is a totally false economy and any body who does this is totally on their own if something bad happens.

Oh, incidentally, the "no reloads" argument doesn't hold any water because the reason for it is totally different.
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Old 09-25-2012, 20:25   #47
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Not hardly.

But, if that's what you believe, precede. The extractor was never designed to hold the case against the breach face although shooting the short cases takes advantage of the extractor to breach dimension relationship. Possibly the manufacturer should just eliminate the final machining of the shoulder in the chamber altogether under the premise that it is unnecessary. I mean, there is no need to regulate case length and the COAL length could be limited by the rifling in the leade.

When I see Glock (or any other manufacturer for that matter) say that it is acceptable to shoot ammunition in any gun for which the gun is not chambered, I'll buy into it. Until then, this is a totally false economy and any body who does this is totally on their own if something bad happens.

Oh, incidentally, the "no reloads" argument doesn't hold any water because the reason for it is totally different.
Really? Get out your sliderule....

The 10mm CASE length tolerance is MUCH less than what the extractor allows. You cannot chamber a case, within tolerance, and have it forward of the extractor. Therefor, it is behind the extractor, with a space between the case mouth and end of the chamber. If the case fully engaged the chamber, every time, the case head would be spaced away from the breach, every time. This has no relevance to what we are discussing.

If your cases are fully engaging the chamber and the breach, the cases are too long, and out of spec. This has nothing to do with the lede/throat.

If the case head is forward of the extractor, it won't fire. If your pistol fires, the case head is being held, by spring tension, firmly against the breach. If it isn't, your gun is broken, or you've chambered a round other than a 10mm.

Whether or not the extractor was ever designed to do this, isn't relevant. It does it, by design or otherwise.
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Old 09-25-2012, 21:14   #48
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I have no dog in this fight, but the time I checked the extractor had .030" slop, which let the case mouth be what set headspace between the min and trim to length.
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Old 09-26-2012, 16:29   #49
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I have no dog in this fight, but the time I checked the extractor had .030" slop, which let the case mouth be what set headspace between the min and trim to length.
I haven't checked this dimension to verify it but development of the "trim to length" has zero to do with the design process which determined the breach face to extractor hook length. dm1906 would argue that the tolerances left in order for the extractor to function properly and for ammunition to feed from the magazine to chamber reliably make the shoulder in the chamber irrelevant. Actually, the shoulder is machined the way it is to limit forward motion of the case during the firing sequence. The extractor was not designed for this purpose. Although a byproduct of it's method of operation and may provide some benefit in this area, the intended mechanics of the operation of the pistol does not include the use of the extractor for this. That being the case the manufacturer never designed the extractor with that in mind. dm1906 would propose that there is no minimum case length specification at all as long as favorable dimensional relationships between the extractor hook, case extractor groove and rim and breach face are maintained. The chamber's shoulder is of no particular significance and could and probably should be deleted as obsolete.

I am not of that particular persuasion and must therefore just agree to disagree.
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Old 09-26-2012, 17:02   #50
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I have tried the experiment and had no issues - maybe I was lucky. Better question is does anyone have any documented proof of a G20 blown up by using 40S&W? I can see beating up the extractor but that is easy enough to change. There appear to be a lot of guys trying this - curious if anyone has really had a bad experience.
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