Glock unsupported chamber

[trackcage]

Not for my 9mm, 10mm, or 45ACP. I have a Lone Wolf barrel to shoot 45Super. I also have a 40S&W conversion barrel for my G20, but that is not because I reload: It is because Glock doesn't make a 40S&W barrel for their G20.


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I went ahead and bought a lone wolf barrel for my G20. For me, after considering the factors it was starting to make sense.

Do I want to shoot cast? Yes, and stock glock barrel CAN do this, although not suggested.

Do I want to reuse my brass? Yes, and 10mm brass is expensive and not readily dropped by others at the range. If there is anything I can do to increase the longevity of my brass, why not? A barrel is less than $100, so we aren't talking about a ton of $$.

And finally, I wanted a stronger recoil spring for hot 10mm loads so I was already placing an order... why not just throw in the barrel while we're at it

If I use the gun for HD use ever, I'll throw the stock barrel and spring back in it to not introduce other factors in a legal worst case scenerio. Probably a moot point as I'll use my G19 for this purpose

[A-Plus Blaster]

I have been using an AUTO DEBULGE 40 to get the bulges out of my brass so they will fit in my race gun.
Works amazingly well and it saves me a lot of time!

[ar15robert]

So why does everyone rave about the glock 20 (10mm)? Seems like that would be THE prime candidate for bulged brass

because its bad azz!IMO a hard round to beat esp for camping or hiking the 10mm is pretty powerful.

I was gonna go with a .357 for a woods camp gun but decided to go for a 10mm.Im a 1911 guy and dont care for glocks not my style but they are reliable and proven.I still love my .45 and it will still be my main target and home defense gun but now have best of both ends.

[Matt P]

A cal guns member Bill Steele wrote this regarding the bulge.

With modern 40 brass and modern Glock chambers, the only way you get smiled brass is from an early unlock or a round that was waaay over SAAMI pressure.

The Glock bulge everyone talks about is not about where the feed ramp intersects the chamber. It is about the generous chamber dimensions down by the breech. They are looser on the straight wall calibers (40, 10, 45 auto) to aid in feed reliability.

These looser dimensions cause the brass to expand a little more than on tighter so-called match chambers. With modern 40 brass, the webs are extremely stout, such that most people never have issues sizing Glock brass, especially if the reload is destined for another Glock chamber.

Some guys do run into issues if they are reloading brass shot from a Glock chamber with a hot load and then reloaded with a conventional sizer. The sizing die may not reach far enough down on the case to size it fully for a tighter match chamber. There are a lot of ways to address this issue. A roll sizer, Redding G-Rx or Lee bulge buster pass through dies will restore any bulged case back to SAAMI spec. Some guys find just using a Lee sizing die (the Lee sizer has its sizing ring very close to the mouth) will do the trick.

In any case, if you are loading brass shot from a Glock chamber for a Glock chamber, no problem. If you want to load brass from a Glock chamber for a tighter match style chamber, just size it with one of the options listed above and you are jake.

PS - Anyone discussing the lack of "safety" of Glock 40S&W chambers with regard to so-called case support are just regurgitating things they have read about issues that did crop up with early Glock 40 guns AND some of the crappiest early 40S&W cases. These issues caused Glock to tighten things up a little in their later chambers and the ammo guys went way overboard in their 40S&W webs, so the problem was fixed twice.

The modern 40S&W web is so stout (far thicker and more radius than a 10mm case, for instance), I use 40 cases to load my 10mm loads all the time. The 40 cases are far more stout. If you doubt me, section one of each and see for yourself.

[Daisy'sDad]

In Glock's armorer class, we were told that an unsupported chamber
allows gases to escape more "safely" in the event of a case or primer failure/rupture.

[igorts]

Glock unsupported chamber

Sounds as "glock excuse"

[NapalmCheese]

Unsupported chamber or not, I've noticed no visual difference in fired brass between Buffalo Bore, Underwood, or PPU ammo. There is some expansion near the web, but no smiles.

[SkyHawk]

I have been using an AUTO DEBULGE 40 to get the bulges out of my brass so they will fit in my race gun.
Works amazingly well and it saves me a lot of time!

Interesting first post - shills a product in a dormant thread

Also noteworthy that it is sold by a company called A-plus. What a coincidence. If you have some financial interest in this product, diisclose it. Don't come in here like some Chinese spammer and insult our intelligence. It never ends well.

[Oceanbob]

Interesting first post - shills a product in a dormant thread

Also noteworthy that it is sold by a company called A-plus. What a coincidence. If you have some financial interest in this product, diisclose it. Don't come in here like some Chinese spammer and insult our intelligence. It never ends well.

Hahaha. TRUE DAT ^^^^

I would have respect for a guy that says "Hey, my company makes a great solution for resizing, try it out..."

Post a link..etc.

Some of these small business owners ......

Bob.

[JTROKS]

Lee factory crimp die user here. It's a great insurance in not having a live round stuck in the chamber.

[JDay]

Look carefully at this pic:


The barrel on the right has a much deeper feed ramp than the one on the left.
This promotes feed reliability but does not fully enclose (support) the case head and web area.
The barrel on the left is considered to be fully supporting the case head and web area.
The exposed web / side portion of the case is where the barrel on the right will cause the bulge to appear.

Any fool can make a feed ramp that is deep and wide that will feed reliably.
The trick is to make the gun feed reliably while still supporting the case head.

Neither of those has a fully supported chamber. This is what a fully supported chamber looks like.

[Pardini]

Glock's feed ramp is partially in the barrel chamber. With high pressure ammo, you will get a bulge. Bulges are cause by over pressure ammo, not poorly designed barrels. S&W Shield pistols in 40S&W also cause the brass to bulge.



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Well that's a serious contradiction.

[ojisan]

JDay you are 100% correct.
I just grabbed the first pic I could find that showed a difference in case web support.

[JDay]

JDay you are 100% correct.
I just grabbed the first pic I could find that showed a difference in case web support.

The pictures I posted are of my USPc 40 barrel. AFAIK Glock doesn't make a barrel with a fully supported chamber.

[JDay]

Well that's a serious contradiction.

And there's no such thing as +P 40 S&W ammo. You'd likely blow up the pistol shooting over pressure 40 S&W. Bulged brass happens with all Glocks regardless of the ammo used.