What is this cartridge???

[StratsMan]

This looks like a brass shotshell, but it has a rim just above the traditional 12 gauge rim... Sorta looks like a magnum ring at the bottom of a belted case... That extra belt also gives in the look of having an extraction groove... It's 3 inches long, all brass, looks to be same diameter as a 12 gauge (I didn't measure the diameter), and it has a blue-tinted plastic cover on the end. Looks like some buffering under the plastic... No markings whatsoever....

This is one piece of a collection that my Father-in-law passed down to me, from his FiL....

Here's a link to some photos...

https://www.dropbox.com/sh/mlmkddm5830d0ee/AACZLNLfM7c-wCyJBwYbUNkga

Your knowledge and insight is always appreciated...

[BrassMagnet]

The primer makes me think it might have been converted to boxer primed from berdan brass.

[StratsMan]

The primer makes me think it might have been converted to boxer primed from berdan brass.

Hmmm.... I thought it looked like a shotshell primer....

[rmatchell]

I have seen 50 bmg converted to shot shell maybe somebody converted a 20mm to a 12ga

[BrassMagnet]

Hmmm.... I thought it looked like a shotshell primer....

I don't load shotshells.

Soon!

[lancem]

I'm thinking it is some type of flare cartridge?

[Frank46]

Maybe engine starting cartridge for prop type planes?. The ones I have seen were rimmed though. Frank

[M-Tecs]

E-mail these folks http://www.oldammo.com/index.htm

or post here http://iaaforum.org/forum3/index.php

[runfiverun]

definitely a shot-shell primer.
the white stuff is buffer, and it looks like buck-shot inside the case.
the belt is weird though I'd almost imagine someone made their rifle into a shotgun with this brass.
without a diameter it's hard to guess what else it would be for.
a 12 ga shell is about .750 on the outside so unless someone knows of a 72-75 cal belted cartridge that ain't it.
16-20 or 24 ga would be my guess.

[M-Tecs]

Very strange one here http://cartridgecollectors.org/cmo/cmo06apr.htm

[MtGun44]

Battery cup primers (shotshell type) are low pressure primers, so it is a low
pressure cartridge. I think the guess of a flare is probably correct.

The weird double rim is unlike anything I have ever seen in any flare -
they mostly look a lot like strange shotshells, brass, aluminum or brass
base with paper or plastic - like a shotshell, and odd sizes.

Bill

[Artful]

I could be wrong but I think it's a 12 Gauge Belted (18.5×76 mmR) from the CAWS shotgun system

http://world.guns.ru/shotgun/de/hk-caws-e.html

http://en.wikipedia.org/wiki/Heckler_%26_Koch_HK_CAWS (http://en.wikipedia.org/wiki/Heckler_%26_Koch_HK_CAWS)

CAW project was from the 1980's

[MaryB]

I think we have a winner! Artful got it I think http://cartridgecollectors.org/cmo/cmo06june.htm

[rmatchell]

Learn somthing new every day

[StratsMan]

Thanks guys!!! Once again, I've gotten info I couldn't find on my own...

[MtGun44]

Definitely a winner. I learned something new, too.

Bill