Supported Chamber???

U

Upjohn

Inactive
I have heard people remark that certain makes or calibers of certain guns do not have a supported chamber.

Will someone please tell me what a SUPPORTED or UNSUPORTED chamber means?
Thanks
 
A fully supported chamber means that the brass cartridge case touches the chamber walls from the mouth to the extraction groove all aroung the case. An unsupported chamber has part of the feed ramp extending into this area, so that the brass case isn't touching the chamber. This causes the brass case to expand into this gap when the pistol is fired; producing a "bulge" in the brass case.
As reloading dies need some degree of an opening taper to work smoothly, especially in a progressive press, they cannot totally remove this bulge at the bottom of the case. This is why Glock says not to reload cases fired in a Glock, because they typically have unsuported chambers in their guns. I think Glock now makes a couple of models that do use a fully supported chamber; and some of the aftermarket barrels for Glocks have fully supported chambers.
 
Now I've never heard of Glock saying not to reload ammo shot in a Glock. I do know they say to not shoot reloads through a Glock, but that is just a CYA measure. I have reloaded many, many 9mm from my Glock with absolutly no problem. I know people who reload the .45 and 10mm with Glocks. The 40 *&* may be different because of the high pressures. However with .45, 9mm, and 10mm there is no problem. I do not have experience with reloading .357 sig ammo.
 
Good case support [to the web] :)

Patriot 45acp
Para Ordanance P14 45acp
Star Firestar 9mm
CZ52 9mm
CZ52 7.62x25
Berretta 1934 .380
Tokarev 9mm
Tokarev 7.62x25

Bad case support :(

Colt 1911 45acp
Glock 20 10mm
Glock 22 40sw
Glock 19 9mm
Kel-Tek P11 9mm
Kel-Tek P32
Para Ordanance P10 45acp
 
<BLOCKQUOTE><font size="1" face="Verdana, Arial">quote:</font><HR>Originally posted by Clark:
Bad case support :(

Colt 1911 45acp
Glock 20 10mm
Glock 22 40sw
Glock 19 9mm
Kel-Tek P11 9mm
Kel-Tek P32
Para Ordanance P10 45acp[/B][/quote]

I believe the G19 is fine, but you should add the G23 nad G27 to your list.
 
I am measuring the Glock 19 as having .190" of case support and the 9mm web is .160" thick for .030" of unsupported case.

A $90 Tokerav has support passed the web! Why can't a Glock 19?
 
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